Arrakis
Encyclopedia
Arrakis — informally known as Dune and later called Rakis — is a fictional desert planet
Desert planet
A desert planet is a single-biome planet on which the climate is mostly desert, with little or no natural precipitation. Desert planets are known to exist; Mars is often considered a prime example. Indeed, many terrestrial planets would be considered desert planets by this definition...

 featured in the Dune series of novels by Frank Herbert
Frank Herbert
Franklin Patrick Herbert, Jr. was a critically acclaimed and commercially successful American science fiction author. Although a short story author, he is best known for his novels, most notably Dune and its five sequels...

. Herbert's first novel in the series, 1965's Dune
Dune (novel)
Dune is a science fiction novel written by Frank Herbert, published in 1965. It won the Hugo Award in 1966, and the inaugural Nebula Award for Best Novel...

, is popularly considered one of the greatest science fiction novels of all time, and it is sometimes cited as the best-selling science fiction novel in history. On April 5, 2010, a real-world plain of Saturn
Saturn
Saturn is the sixth planet from the Sun and the second largest planet in the Solar System, after Jupiter. Saturn is named after the Roman god Saturn, equated to the Greek Cronus , the Babylonian Ninurta and the Hindu Shani. Saturn's astronomical symbol represents the Roman god's sickle.Saturn,...

's moon Titan
Titan (moon)
Titan , or Saturn VI, is the largest moon of Saturn, the only natural satellite known to have a dense atmosphere, and the only object other than Earth for which clear evidence of stable bodies of surface liquid has been found....

 was named Arrakis Planitia after Herbert's fictional planet.

In Dune, the planet is the home of the Fremen
Fremen
The Fremen are a group of people in the fictional Dune universe created by Frank Herbert. First appearing in the 1965 novel Dune, the Fremen inhabit the desert planet Arrakis and are based on the desert-dwelling Bedouin and Kalahari Bushmen. In Herbert's novels, Arrakis is the sole known source...

 (Zensunni
Zensunni
The Religions of Dune are a key aspect of the fictional setting of the Dune universe created by Frank Herbert. Many of the names of religions mentioned in the novels indicate they are blends of current belief systems, some syncretic....

 wanderers), and subsequently is the Imperial Capital of the Atreides Empire
House Atreides
House Atreides is a fictional noble family from the Dune universe created by Frank Herbert. One of the Great Houses of the feudal interstellar empire known as the Imperium, its members play a role in every novel in the series. It is suggested within the series that the root of the Atreides line...

. Arrakis is the third planet orbiting the star Canopus, and it in turn is orbited by two moons, one of which has the image of the desert kangaroo mouse
Kangaroo mouse
A kangaroo mouse is either one of the two species of jumping mouse native to the deserts of the Southwestern United States, predominantly found in the state of Nevada. Although native to the deserts in the southwest they have been plentiful in Missouri and Pennsylvania...

, Muad'Dib
Muad'Dib
Muad'Dib is a desert mouse within Frank Herbert's Dune universe. It is also the name for a constellation of stars and is taken as a name by the first novel's hero, Paul Atreides.-Dune glossary:...

, on it; the other moon possesses the image of a human hand.

Environment and the spice

A desert planet with no natural precipitation
Precipitation (meteorology)
In meteorology, precipitation In meteorology, precipitation In meteorology, precipitation (also known as one of the classes of hydrometeors, which are atmospheric water phenomena is any product of the condensation of atmospheric water vapor that falls under gravity. The main forms of precipitation...

, in Dune it is established that Arrakis had been "His Imperial Majesty's Desert Botanical Testing Station" before the discovery of melange, for which it is the only natural source in the universe. Melange (or, "the spice") is the most essential and valuable commodity in the universe, as it extends life and makes safe interstellar travel possible (among other uses). The planet has no surface water bodies, but open canals called qanat
Qanat
A qanāt is a water management system used to provide a reliable supply of water for human settlements and irrigation in hot, arid and semi-arid climates...

s are used "for carrying irrigation water under controlled conditions" through the desert. The Fremen collect water in underground reservoirs to fulfill their dream of someday terraforming
Terraforming
Terraforming of a planet, moon, or other body is the hypothetical process of deliberately modifying its atmosphere, temperature, surface topography or ecology to be similar to those of Earth, in order to make it habitable by terrestrial organisms.The term is sometimes used more generally as a...

 the planet, and pay the Spacing Guild
Spacing Guild
The Spacing Guild is an organization in Frank Herbert's science fiction Dune universe. With its monopoly on interstellar travel and banking, the Guild is a balance of power against the Padishah Emperor and the assembled noble Houses of the Landsraad...

 exorbitant fees in melange to keep the skies over Arrakis free of any satellites which might observe their efforts. As indicated by its large salt flat
Salt pan (geology)
Natural salt pans are flat expanses of ground covered with salt and other minerals, usually shining white under the sun. They are found in deserts, and should not be confused with salt evaporation ponds.A salt pan is formed where water pools...

s, Arrakis once had lakes and oceans; Lady Jessica also notes in Dune that wells drilled in the sinks and basins initially produce a "trickle" of water which soon stops, as if "something plugs it." Paul Atreides
Paul Atreides
Paul Atreides is a fictional character in the Dune universe created by Frank Herbert. Paul is a prominent character in the first two novels in the series, Dune and Dune Messiah , and returns in Children of Dune . The character is brought back as two different gholas in the Brian Herbert/Kevin J...

 recalls that the few plants and animals on the planet include "saguaro
Saguaro
The saguaro is a large, tree-sized cactus species in the monotypic genus Carnegiea. It is native to the Sonoran Desert in the U.S. state of Arizona, the Mexican state of Sonora, a small part of Baja California in the San Felipe Desert and an extremely small area of California, U.S...

, burro bush, date palm
Date Palm
The date palm is a palm in the genus Phoenix, cultivated for its edible sweet fruit. Although its place of origin is unknown because of long cultivation, it probably originated from lands around the Persian Gulf. It is a medium-sized plant, 15–25 m tall, growing singly or forming a clump with...

, sand verbena, evening primrose
Evening Primrose
Evening Primrose is a musical with a book by James Goldman and lyrics and music by Stephen Sondheim. It is based on a John Collier short story published in the 1951 collection Fancies and Goodnights....

, barrel cactus
Barrel cactus
Barrel cacti are classified into the two genera Echinocactus and Ferocactus, both of which are found in the Southwest Desert of North America. Their pineapple-shaped fruits can be easily removed but are not recommended for eating. The barrel cactus may reach over a metre in height. Its ribs are...

, incense
Incense
Incense is composed of aromatic biotic materials, which release fragrant smoke when burned. The term "incense" refers to the substance itself, rather than to the odor that it produces. It is used in religious ceremonies, ritual purification, aromatherapy, meditation, for creating a mood, and for...

 bush, smoke tree
Smoke tree
Smoketree or Smoke bush is a genus of two species of flowering plants in the family Anacardiaceae, closely related to the sumacs .-Characteristics:...

, creosote bush
Creosote bush
Larrea tridentata is known as Creosote bush as a plant, chaparral as a medicinal herb, and as "gobernadora" in Mexico, Spanish for "governess," due to its ability for inhibiting the growth of nearby plants to have more water. In Sonora, it is more commonly called "hediondilla." It is a flowering...

 ... kit fox
Kit Fox
The kit fox is a fox species of North America. Its range is primarily in the southwestern United States and northern and central Mexico. Some mammalogists classify it as conspecific with the swift fox, V. velox, but molecular systematics imply that the two species are distinct.-Range:The...

, desert hawk, kangaroo mouse ... many to be found now nowhere else in the universe except here on Arrakis." The most notable life forms on the planet are the giant sandworm
Sandworm (Dune)
The sandworm is a fictional form of desert-dwelling creature from the Dune universe created by Frank Herbert. They first appear in the 1965 novel Dune, considered to be among the classics in the science fiction genre, and are iconic of the Dune series.In the series, the sandworms called Shai-Hulud...

s and their immature forms of sandtrout and sandplankton. Sandtrout encyst any water deposits; predator fish are placed in the qanats and other water storage areas to protect them from the sandtrout. In Children of Dune
Children of Dune
Children of Dune is a 1976 science fiction novel by Frank Herbert, third in a series of six novels set in his Dune universe. Initially selling over 75,000 copies, it became the first hardcover best-seller ever in the science fiction field...

(1976), Leto Atreides II
Leto Atreides II
Leto Atreides II is a fictional character from the Dune universe created by Frank Herbert. Born at the end of Dune Messiah , Leto is a central character in Children of Dune and is the title character of God Emperor of Dune . The character is brought back as a ghola in the Brian Herbert/Kevin J...

 explains to his twin sister Ghanima:
The sandtrout ... was introduced here from some other place. This was a wet planet then. They proliferated beyond the capability of existing ecosystems to deal with them. Sandtrout encysted the available free water, made this a desert planet ... and they did it to survive. In a planet sufficiently dry, they could move to their sandworm phase.

The Dune Encyclopedia

The non-canon
Canon (fiction)
In the context of a work of fiction, the term canon denotes the material accepted as "official" in a fictional universe's fan base. It is often contrasted with, or used as the basis for, works of fan fiction, which are not considered canonical...

 Dune Encyclopedia (1984) theorizes that the depletion of the oceans (the primary result of which was desertification
Desertification
Desertification is the degradation of land in drylands. Caused by a variety of factors, such as climate change and human activities, desertification is one of the most significant global environmental problems.-Definitions:...

) was probably caused by the impact or near miss of a comet or other quasi-planetary body. This event caused the loss of much of the atmosphere of Arrakis, allowing most of the oxygen and water to escape into space. This is thought to have occurred approximately 50 million years before the Imperium's creation. This catastrophic loss of oxygen led to the extinction of nearly all native fauna and then therefore the flora
Flora
Flora is the plant life occurring in a particular region or time, generally the naturally occurring or indigenous—native plant life. The corresponding term for animals is fauna.-Etymology:...

.

The Encyclopedia also explains that one of the few forms to survive were tiny worms of the phylum Protochordata. One of these forms was Shaihuludata, a genus of anaerobic burrowing worm that was the basal species from which the giant sandworms (Geonemotodium arraknis or Shaihuludata gigantica) evolved. Rather than sandworm creating desert, it was desert that created sandworm. The mass extinction of all of its predators and competitors for food allowed the animal, in a manner somewhat analogous to the evolution of unique faunal forms on isolated Terran islands, to take the evolutionary path that would not only re-oxygenate the Arrakeen atmosphere, but also create the spice melange with all of its immense consequences for humanity.

Finally, the Encyclopedia notes that early in the history of Arrakis, the Imperium made several attempts to terraform the planet, which resulted in an abundance of Terran
Earth
Earth is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets...

 desert life on the planet (such as kangaroo mice and hawks), but failed to otherwise change the environment, as the local sandtrout "encyst" any open water on the planet.

Frank Herbert's own Children of Dune, however, establishes that the sandtrout were brought to Arrakis from elsewhere. In the 1985 novel Chapterhouse: Dune, Chapterhouse is turned into a desert planet by transplanting sandtrout there.

Inhabitants

Fremen

The Zensunni
Zensunni
The Religions of Dune are a key aspect of the fictional setting of the Dune universe created by Frank Herbert. Many of the names of religions mentioned in the novels indicate they are blends of current belief systems, some syncretic....

 wanderers, driven from planet to planet, eventually found their way to Arrakis, where they became the Fremen
Fremen
The Fremen are a group of people in the fictional Dune universe created by Frank Herbert. First appearing in the 1965 novel Dune, the Fremen inhabit the desert planet Arrakis and are based on the desert-dwelling Bedouin and Kalahari Bushmen. In Herbert's novels, Arrakis is the sole known source...

. They settled in artificial cave-like settlements known as sietches across the Arrakeen deserts. They also developed stillsuit technology, allowing them to survive in the open desert. By harvesting melange, they were able to bribe the Spacing Guild
Spacing Guild
The Spacing Guild is an organization in Frank Herbert's science fiction Dune universe. With its monopoly on interstellar travel and banking, the Guild is a balance of power against the Padishah Emperor and the assembled noble Houses of the Landsraad...

 for privacy from observation and weather control in order to hide from the Imperium their true population and their plans to terraform Arrakis. Much of this ecological activity took place in the unexplored southern latitudes of the planet. The best-known of the sietches is Sietch Tabr, home of Stilgar
Stilgar
Stilgar is a fictional character in the Dune universe created by Frank Herbert. He appears in the first three novels in the series: Dune , Dune Messiah and Children of Dune . His early life is explored in Brian Herbert and Kevin J...

 and Muad'Dib
Paul Atreides
Paul Atreides is a fictional character in the Dune universe created by Frank Herbert. Paul is a prominent character in the first two novels in the series, Dune and Dune Messiah , and returns in Children of Dune . The character is brought back as two different gholas in the Brian Herbert/Kevin J...

's center of operations before victory in the Battle of Arrakeen put Muad'Dib on the Imperial throne.

According to the Legends of Dune
Legends of Dune
Legends of Dune is a prequel trilogy of novels written by Brian Herbert and Kevin J. Anderson, set in Frank Herbert's Dune universe.* Dune: The Butlerian Jihad * Dune: The Machine Crusade * Dune: The Battle of Corrin...

prequel
Prequel
A prequel is a work that supplements a previously completed one, and has an earlier time setting.The widely recognized term was a 20th-century neologism, and a portmanteau from pre- and sequel...

 trilogy
Trilogy
A trilogy is a set of three works of art that are connected, and that can be seen either as a single work or as three individual works. They are commonly found in literature, film, or video games...

 by Brian Herbert
Brian Herbert
Brian Patrick Herbert is an American author who lives in Washington state. He is the elder son of science fiction author Frank Herbert....

 and Kevin J. Anderson
Kevin J. Anderson
Kevin J. Anderson is an American science fiction author with over forty bestsellers. He has written spin-off novels for Star Wars, StarCraft, Titan A.E., and The X-Files, and with Brian Herbert is the co-author of the Dune prequels...

, it was a group of Zensunni wanderers escaping slavery
Slavery
Slavery is a system under which people are treated as property to be bought and sold, and are forced to work. Slaves can be held against their will from the time of their capture, purchase or birth, and deprived of the right to leave, to refuse to work, or to demand compensation...

 on the planet Poritrin who originally crashed on Dune in a prototype interstellar spacecraft several years prior to the creation of the Spacing Guild
Spacing Guild
The Spacing Guild is an organization in Frank Herbert's science fiction Dune universe. With its monopoly on interstellar travel and banking, the Guild is a balance of power against the Padishah Emperor and the assembled noble Houses of the Landsraad...

.

Plotlines

During the events of Dune
Dune (novel)
Dune is a science fiction novel written by Frank Herbert, published in 1965. It won the Hugo Award in 1966, and the inaugural Nebula Award for Best Novel...

, the Padishah Emperor
Padishah Emperor
Padishah Emperor is the title given to the hereditary rulers of the Old Empire in the science fiction Dune universe created by Frank Herbert.-Original series:...

 Shaddam Corrino IV
Shaddam Corrino IV
Shaddam Corrino IV is a fictional character in the Dune universe created by Frank Herbert. He is Padishah Emperor of the known universe in Herbert's 1965 novel Dune. Shaddam's accession to the throne is chronicled in the Prelude to Dune prequel trilogy by Brian Herbert and Kevin J. Anderson.Born...

 grants Duke Leto Atreides I
Leto Atreides I
Duke Leto Atreides I is a fictional character in the Dune universe created by Frank Herbert. He features in the novel Dune by Frank Herbert and in the Prelude to Dune prequel trilogy by Brian Herbert and Kevin J. Anderson....

 control of the lucrative spice harvesting operations of Arrakis, ousting the Atreides' longtime rivals, the Harkonnens
House Harkonnen
House Harkonnen is a powerful noble family in Frank Herbert's fictional Dune universe. The Harkonnens are featured prominently in the original 1965 novel Dune, and are also a major presence in both the Prelude to Dune and Legends of Dune prequel trilogies by Brian Herbert and Kevin J. Anderson...

. The Atreides rule is cut short by a murderous conspiracy
Conspiracy (political)
In a political sense, conspiracy refers to a group of persons united in the goal of usurping or overthrowing an established political power. Typically, the final goal is to gain power through a revolutionary coup d'état or through assassination....

 crafted by the Harkonnens and Emperor himself. Leto's son Paul Atreides
Paul Atreides
Paul Atreides is a fictional character in the Dune universe created by Frank Herbert. Paul is a prominent character in the first two novels in the series, Dune and Dune Messiah , and returns in Children of Dune . The character is brought back as two different gholas in the Brian Herbert/Kevin J...

 (known by the Fremen as Muad'Dib
Muad'Dib
Muad'Dib is a desert mouse within Frank Herbert's Dune universe. It is also the name for a constellation of stars and is taken as a name by the first novel's hero, Paul Atreides.-Dune glossary:...

) later leads a massive Fremen army to victory over the Emperor's Sardaukar
Sardaukar
The Sardaukar are a fictional fanatical army from Frank Herbert's Dune universe, primarily featured in the 1965 science fiction novel Dune, as well as Brian Herbert and Kevin J...

 soldier-fanatics, and by threatening the destruction of all spice production on Arrakis manages to depose Shaddam and ascend the throne in his place. With Emperor Paul worshipped as a god, Arrakis becomes the governmental and religious center of the Imperium.

Paul Muad'Dib continues the efforts to terraform
Terraforming
Terraforming of a planet, moon, or other body is the hypothetical process of deliberately modifying its atmosphere, temperature, surface topography or ecology to be similar to those of Earth, in order to make it habitable by terrestrial organisms.The term is sometimes used more generally as a...

 Arrakis into a green world, a plan begun by the Fremen under the guidance of Imperial Planetologist Pardot Kynes
Pardot Kynes
Pardot Kynes is a fictional character in the Dune universe created by Frank Herbert. He was the Imperial Planetologist of Arrakis prior to the start of the novel Dune, and was featured in the Prelude to Dune series by Brian Herbert and Kevin J. Anderson.Pardot Kynes was first introduced in the...

 and his son Liet-Kynes
Liet-Kynes
Liet-Kynes is a fictional character in the Dune universe created by Frank Herbert. He is primarily featured in the 1965 novel Dune, but also appears in the Prelude to Dune prequel trilogy by Brian Herbert and Kevin J. Anderson...

. The core of their plan is gradual water-collection from the Arrakeen atmosphere to form large reservoirs that would, eventually, become lakes and oceans. Much of this activity takes place in the unexplored southern latitudes of Arrakis.

By the time of Children of Dune, Alia Atreides
Alia Atreides
Alia Atreides is a fictional character in the Dune universe created by Frank Herbert. Introduced in the first novel of the series, 1965's Dune, the character was originally killed in Herbert's first version of the manuscript. At the suggestion of Analog magazine editor John Campbell, Herbert kept...

 (and then Leto II and Ghanima) realize that the ecological transformation of Arrakis is altering the sandworm cycle, which would eventually result in the end of all spice production. This at first seems a future to be avoided, but Leto II later uses this eventuality as part of his Golden Path to ultimately save humanity. Once he himself begins the transformation into a human/sandworm hybrid, he eradicates all desert on Arrakis except for a small area he makes his base of operations, and destroys all of the sandworms save one — himself.

After his death some 3,500 years later in God Emperor of Dune
God Emperor of Dune
God Emperor of Dune is a science fiction novel by Frank Herbert published in 1981, the fourth in the Dune series. It was ranked as the #11 hardcover fiction best seller of 1981 by Publishers Weekly.-Plot introduction:...

, Leto's worm-body is transformed back into sandtrout. Within only a few centuries, these sandtrout return Arrakis (thence called 'Rakis') to a desert.

In Heretics of Dune
Heretics of Dune
Heretics of Dune is a 1984 science fiction novel by Frank Herbert, fifth in a series of six novels. It was ranked as the #13 hardcover fiction best seller of 1984 by The New York Times.-Plot introduction:...

, all life on Arrakis is destroyed (and the entire surface of the planet slagged into oblivion) by the Honored Matres
Honored Matres
The Honored Matres are a fictional matriarchal organization in Frank Herbert's science fiction Dune universe. They are described as an aggressive cult obsessed with power, violence and sexual domination...

 in a failed attempt to eliminate the latest Duncan Idaho
Duncan Idaho
Duncan Idaho is a fictional character in the Dune universe created by Frank Herbert. Introduced in the first novel of the series, 1965's Dune, the character became a breakout character as the readers liked him and was revived by Herbert in 1969's Dune Messiah...

 ghola. The Bene Gesserit
Bene Gesserit
The Bene Gesserit are a key social, religious, and political force in Frank Herbert's science fiction Dune universe. The group is described as an exclusive sisterhood whose members train their bodies and minds through years of physical and mental conditioning to obtain superhuman powers and...

 escape with a single sandworm, and drown it to revert the worm back into sandtrout. In Chapterhouse: Dune the Bene Gesserit use these sandtrout to begin a new sandworm cycle on their homeworld of Chapterhouse, which is terraformed into desert for this purpose.

Finally, in Sandworms of Dune
Sandworms of Dune
Sandworms of Dune is the second of two novels written by Brian Herbert and Kevin J. Anderson to conclude Frank Herbert's original Dune series of novels. They have stated that it is based on notes left behind by Frank Herbert for Dune 7, his own planned seventh novel in the Dune series...

, some sandworms are revealed to be alive and well, having sensed the upper crust would be destroyed, and therefore burrowed even deeper, escaping the blast.

Cities and features

ARRAKEEN: first settlement on Arrakis; long-time seat of planetary government. — Dune
Dune (novel)
Dune is a science fiction novel written by Frank Herbert, published in 1965. It won the Hugo Award in 1966, and the inaugural Nebula Award for Best Novel...

, Terminology of the Imperium

Arrakis' capital and largest city historically is Arrakeen (ærəˈkiːn). Arrakeen housed an ostentatious palace, which had been "the government mansion in the days of the Old Empire"; prior to the arrival of the Atreides
House Atreides
House Atreides is a fictional noble family from the Dune universe created by Frank Herbert. One of the Great Houses of the feudal interstellar empire known as the Imperium, its members play a role in every novel in the series. It is suggested within the series that the root of the Atreides line...

 on Arrakis, the Emperor's right-hand man Count Fenring
Hasimir Fenring
Count Hasimir Fenring is a fictional character in the Dune universe created by Frank Herbert. He is featured in the science fiction novel Dune by Frank Herbert, and is also a key character in the Prelude to Dune trilogy by Brian Herbert and Kevin J...

 and his wife Margot
Margot Fenring
Lady Margot Fenring is a fictional character from the Dune universe created by Frank Herbert. She is featured in Herbert's Dune , and is a major character in the Prelude to Dune prequel trilogy by Brian Herbert and Kevin J...

 had resided there. Leto I had chosen Arrakeen for his seat of government because it "was a smaller city, easier to sterilize and defend."

In Dune, Leto's concubine
Concubinage
Concubinage is the state of a woman or man in an ongoing, usually matrimonially oriented, relationship with somebody to whom they cannot be married, often because of a difference in social status or economic condition.-Concubinage:...

 Lady Jessica has this first impression of the Great Hall:
Jessica stood in the center of the hall ... looking up and around at shadowed carvings, crannies and deeply recessed windows. This giant anachronism of a room reminded her of the Sisters' Hall at her Bene Gesserit school. But at the school the effect had been of warmth. Here, all was bleak stone. Some architect had reached far back into history for these buttressed walls and dark hangings, she thought. The arched ceiling stood two stories above her with great crossbeams she felt sure had been shipped here to Arrakis across space at monstrous cost. No planet of this system grew trees to make such beams — unless the beams were imitation wood. She thought not.


Arrakeen would go through multiple transformations over time; it first becomes an Imperial capital of staggering proportions under Paul Muad'Dib. It is later transformed into a festival city known as Onn, explicitly for the worship of the Tyrant Leto II. Finally, in the centuries after his death, it is known as Keen, a modern (though still impressive) city to house the Priesthood of Rakis.

Sietch Tabr

In Dune, Sietch Tabr is a major Fremen sietch originally led by Naib Stilgar. Paul Atreides and his mother Lady Jessica, fleeing a Harkonnen attack, come upon Sietch Tabr and are eventually accepted into the community. Within the sietch Paul founds the resistance movement that eventually takes control of Arrakis, allowing him to depose the Emperor. Paul moves his base of operations to Arrakeen, but Sietch Tabr remains a center of Fremen culture and politics, as well as a religiously significant site for those who worship Paul as a messiah
Messiah
A messiah is a redeemer figure expected or foretold in one form or another by a religion. Slightly more widely, a messiah is any redeemer figure. Messianic beliefs or theories generally relate to eschatological improvement of the state of humanity or the world, in other words the World to...

. All Fremen sietches but one are abandoned after the terraforming of Arrakis, their exact locations remaining a mystery for thousands of years.

The Keep

During the reign of Muad'Dib until the ascension of his son Leto II, the Atreides home-base was a colossal megastructure
Megastructure
A megastructure is a very large manmade object, though the limits of precisely how large this is vary considerably. Some apply the term to any especially large or tall building....

 in Arrakeen, designed to intimidate, known as the Keep. In Dune Messiah
Dune Messiah
Dune Messiah is a science fiction novel by Frank Herbert, the second in a series of six novels. It was originally serialized in Galaxy magazine in 1969. The American and British editions have different prologues summarizing events in the previous novel...

, the fortress is described as being large enough to enclose entire cities.

Grand Palace of Arrakeen

In his 1985 short work "The Road to Dune" (published in the short story
Short story
A short story is a work of fiction that is usually written in prose, often in narrative format. This format tends to be more pointed than longer works of fiction, such as novellas and novels. Short story definitions based on length differ somewhat, even among professional writers, in part because...

 collection Eye
Eye (Frank Herbert)
Eye is a collection of thirteen short stories written by science fiction author Frank Herbert. All of the works had been previously published in magazine or book form, except for "The Road to Dune."-Introduction:...

), Frank Herbert described the Grand Palace of Arrakeen (and other sites) during the reign of Paul Atreides:
Your walking tour of Arrakis must include this approach across the dunes to the Grand Palace at Arrakeen. From a distance, the dimensions of this construction are deceptive ... The largest man-made structure ever built, the Grand Palace could cover more than ten of the Imperium's most populous cities under one roof, a fact that becomes more apparent when you learn Atreides attendants and their families, housed spaciously in the Palace Annex, number some thirty-five million souls ... When you walk into the Grand Reception Hall of the Palace at Arrakeen, be prepared to feel dwarfed before an immensity never before conceived. A statue of St. Alia Atreides, shown as "The Soother of Pains," stands twenty-two meters tall but is one of the smallest adornments in the hall. Two hundred such statues could be stacked one atop the other against the entrance pillars and still fall short of the doorway's capitol arch, which itself is almost a thousand meters below the first beams upholding the lower roof.


Temple of Alia

Alia's Fane (or Alia's Temple) is the two-kilometer wide temple Paul-Muad'Dib built for his sister Alia between the events of Dune and Dune Messiah. Herbert described it in The Road to Dune:
If you are numbered among "the heartfelt pilgrims," you will cross the last thousand meters of this approach to the Temple of Alia on your knees. Those thousand meters fall well within the sweeping curves leading your eyes up to the transcendent symbols dedicating this Temple to St. Alia of the Knife. The famed "Sun-Sweep Window" incorporates every solar calendar known to human history in the one translucent display whose brilliant colors, driven by the sun of Dune, thread through the interior on prismatic pathways.

The Citadel of Leto II

The Tyrant Leto II rules the universe from the Citadel, a fortress built in the Last Desert of the Sareer. The Sareer is flanked by the Forbidden Forest, home of the ferocious D-wolves, the guardians of the Sareer. Beyond that lies the Idaho River, across which a bridge spans that leads to the festival city of Onn (once Arrakeen). Mount Idaho had been completely demolished to provide the raw materials to build the high walls surrounding the Sareer. The Citadel itself is taken apart in the Famine Times after the death of Leto II in search of his alleged hoard of spice.

Other locations

All Imperial cities on Arrakis are in the far-northern latitudes of the planet and protected from the violent weather of Arrakis by a natural formation known as the Shield Wall. When the Harkonnens controlled the planet, they ruled from the Harkonnen-built "megalopolis
Megalopolis (city type)
A megalopolis is typically defined as a chain of roughly adjacent metropolitan areas. The term was used by Oswald Spengler in his 1918 book, The Decline of the West, and Lewis Mumford in his 1938 book, The Culture of Cities, which described it as the first stage in urban overdevelopment and...

" of Carthag, described by Jessica as "a cheap and brassy place some two hundred kilometers northeast across the Broken Land." Arrakeen was merely the titular capital until the arrival of the Atreides.

There are other cities scattered in the northern regions of the planet (especially near the ice cap, where water is harvested), as well as the Fremen sietch communities scattered throughout the desert.

Other notable sites on Arrakis throughout its history include Observatory Mountain, Mount Idaho, Dar-es-balat and the Kynes Sea.

Prequels

The interquel novel Paul of Dune
Paul of Dune
Heroes of Dune is a planned interquel tetralogy of novels by Brian Herbert and Kevin J. Anderson set in the Dune universe created by Frank Herbert. The potential series was initially referred to as Paul of Dune by the authors as early as 2004....

(2008) by Brian Herbert
Brian Herbert
Brian Patrick Herbert is an American author who lives in Washington state. He is the elder son of science fiction author Frank Herbert....

 and Kevin J. Anderson
Kevin J. Anderson
Kevin J. Anderson is an American science fiction author with over forty bestsellers. He has written spin-off novels for Star Wars, StarCraft, Titan A.E., and The X-Files, and with Brian Herbert is the co-author of the Dune prequels...

 establishes that the first known inhabitants of Arrakis had been the Muadru, who introduced the sandworms to the planet. They had settlements all over the galaxy which suddenly disappeared; the Zensunni Wanderers later came, ultimately becoming the Fremen
Fremen
The Fremen are a group of people in the fictional Dune universe created by Frank Herbert. First appearing in the 1965 novel Dune, the Fremen inhabit the desert planet Arrakis and are based on the desert-dwelling Bedouin and Kalahari Bushmen. In Herbert's novels, Arrakis is the sole known source...

. In the novel Paul notes, "There appears to be a linguistic connection between the Fremen and the Muadru."
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