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Emi Koussi is a high shield volcano
Shield volcano

A shield volcano is a large volcano with shallow-sloping sides. The name derives from a translation of "Skjaldbrei?ur", an Icelandic shield volcano whose name means "broad shield", from its resemblance to a warrior's shield....
 that lies at the south end of the Tibesti Mountains
Tibesti Mountains

The Tibesti Mountains are a group of dormant volcanoes forming a mountain range in the central Sahara desert in the Bourkou-Ennedi-Tibesti Region of northern Chad....
 in the central Sahara
Sahara

The Sahara is the world's largest hot desert. At over 9,000,000 square kilometers , it covers most of Northern Africa, making it almost as large as the United States or the continent of Europe....
 of northern Chad
Chad

Chad , officially known as the Republic of Chad, is a landlocked country in central Africa. It is bordered by Libya to the north, Sudan to the east, the Central African Republic to the south, Cameroon and Nigeria to the southwest, and Niger to the west....
. It is the highest mountain in Chad, and the highest in the Sahara. The volcano is one of several in the Tibesti massif, and reaches 3445 m in altitude, rising 2.3 km above the surrounding sandstone plains. The volcano is 60 by 80 km wide.

Two nested caldera
Caldera

A caldera is a cauldron-like volcano feature usually formed by the collapse of land following a volcanic eruption such as the one at Yellowstone National Park....
s cap the volcano, the outer one being about 12 by 15 km in size.






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Emi Koussi is a high shield volcano
Shield volcano

A shield volcano is a large volcano with shallow-sloping sides. The name derives from a translation of "Skjaldbrei?ur", an Icelandic shield volcano whose name means "broad shield", from its resemblance to a warrior's shield....
 that lies at the south end of the Tibesti Mountains
Tibesti Mountains

The Tibesti Mountains are a group of dormant volcanoes forming a mountain range in the central Sahara desert in the Bourkou-Ennedi-Tibesti Region of northern Chad....
 in the central Sahara
Sahara

The Sahara is the world's largest hot desert. At over 9,000,000 square kilometers , it covers most of Northern Africa, making it almost as large as the United States or the continent of Europe....
 of northern Chad
Chad

Chad , officially known as the Republic of Chad, is a landlocked country in central Africa. It is bordered by Libya to the north, Sudan to the east, the Central African Republic to the south, Cameroon and Nigeria to the southwest, and Niger to the west....
. It is the highest mountain in Chad, and the highest in the Sahara. The volcano is one of several in the Tibesti massif, and reaches 3445 m in altitude, rising 2.3 km above the surrounding sandstone plains. The volcano is 60 by 80 km wide.

Two nested caldera
Caldera

A caldera is a cauldron-like volcano feature usually formed by the collapse of land following a volcanic eruption such as the one at Yellowstone National Park....
s cap the volcano, the outer one being about 12 by 15 km in size. Within it on the southeast side is a smaller caldera, about 2-3 km wide and 350 m deep. Numerous lava dome
Lava dome

In volcanology, a lava dome or plug dome is a roughly circular mound-shaped protrusion resulting from the slow eruption of felsic lava from a volcano, or from multiple lava episodes of different magma types....
s, cinder cone
Cinder cone

According to the , Cinder Cone is the proper name of 1 cinder cone in Canada and 7 cinder cones in the United States:In Canada: Cinder Cone ...
s, maar
Maar

A maar is a broad, low-relief volcanic crater that is caused by a phreatomagmatic eruption, an explosion caused by groundwater coming into contact with hot lava or magma....
s, and lava flows are found both within the calderas and along the outer flanks of the shield.

Emi Koussi has been used as a close analog to the famous Martian volcano Elysium Mons
Elysium Mons

Elysium Mons is a volcano on Mars located in the Elysium Planitia, at 25?N, 213?W, in the Martian eastern hemisphere. It stands about 13.9 km above the surrounding lava plains, and about 16 km above the Areography....
. One of the most important morphological differences between volcanoes on Mars
MARS

In cryptography, MARS is a block cipher that was IBM's submission to the Advanced Encryption Standard process. MARS was selected as an AES finalist in August 1999, after the AES2 conference in March 1999, where it was voted as the fifth and last finalist algorithm....
 and Earth
Earth

Earth is the third planet from the Sun. Earth is the largest of the terrestrial planets in the Solar System in diameter, mass and density. It is also referred to as the World and Wiktionary:Terra.Note that by International Astronomical Union convention, the term "Terra" is used for naming extensive land masses, rather...
 is the widespread furrowing of the surface due to flowing water on terrestrial volcanoes. The furrows are shallow valleys. Larger channels have a different origin. Major channels can be seen on volcanoes on both planets and indicate low points in caldera
Caldera

A caldera is a cauldron-like volcano feature usually formed by the collapse of land following a volcanic eruption such as the one at Yellowstone National Park....
 rims where lava
Lava

Lava is molten Rock expelled by a volcano during an eruption. When first expelled from a volcanic vent, it is a liquid at temperatures from 700 ?C to 1,200 ?C ....
 spilled out of pre-collapse craters.

See also