Calpe also known "Kerpe" (Kerpe Limanı) is a location in Thrace

Thrace

Thrace is a historical and geographic area in southeast Europe. As a geographical concept, Thrace designates a region bounded by the Balkan Mountains on the north, Rhodope Mountains and the Aegean Sea on the south, and by the Black Sea and the Sea of Marmara on the east...

 in Asia Minor

Asia Minor

Asia Minor is a geographical location at the westernmost protrusion of Asia, also called Anatolia, and corresponds to the western two thirds of the Asian part of Turkey...

, on the shore of the Black Sea

Black Sea

The Black Sea is bounded by Europe, Anatolia and the Caucasus and is ultimately connected to the Atlantic Ocean via the Mediterranean and the Aegean seas and various straits. The Bosphorus strait connects it to the Sea of Marmara, and the strait of the Dardanelles connects that sea to the Aegean...

, that was mentioned in Xenophon

Xenophon

Xenophon , son of Gryllus, of the deme Erchia of Athens, also known as Xenophon of Athens, was a Greek historian, soldier, mercenary, philosopher and a contemporary and admirer of Socrates...

's Anabasis

Anabasis (Xenophon)

Anabasis is the most famous work, in seven books, of the Greek professional soldier and writer Xenophon. The journey it narrates is his best known accomplishment and "one of the great adventures in human history," as Will Durant expressed the common assessment.- The account :Xenophon accompanied...

.

A river of Bithynia

Bithynia

Bithynia was an ancient region, kingdom and Roman province in the northwest of Asia Minor, adjoining the Propontis, the Thracian Bosporus and the Euxine .-Description:...

, the Chalpas of Strabo

Strabo

Strabo, also written Strabon was a Greek historian, geographer and philosopher.-Life:Strabo was born to an affluent family from Amaseia in Pontus , a city which he said was situated the approximate equivalent of 75 km from the Black Sea...

. It lies between the Psilis, from which it is 210 stadia distant, and the Sangarius. There was also a port called the port of Calpe. Xenophon (Anab. vi. 4), who passed through the place on his retreat with the Ten Thousand

Ten Thousand (Greek)

The Ten Thousand were a group of mercenary units, mainly Greek, drawn up by Cyrus the Younger to attempt to wrest the throne of the Persian Empire from his brother, Artaxerxes II...

, describes it as about half way between Byzantium

Byzantium

Byzantium was an ancient Greek city, founded by Greek colonists from Megara in 667 BC and named after their king Byzas . The name Byzantium is a Latinization of the original name Byzantion...

 and Heracleia

Heraclea Pontica

Heraclea Pontica , an ancient city on the coast of Bithynia in Asia Minor, at the mouth of the river Lycus. It was founded by the Greek city-state of Megara c.560-558 and was named after Heracles who the Greeks believed entered the underworld at a cave on the adjoining Archerusian promontory .The...

: it is a promontory, and the part which projects into the sea is an abrupt precipice. The neck which connects the promontory with the mainland is only 400 feet (121.9 m) wide. The port is under the rock to the west, and has a beach; and close to the sea there is a source of fresh water. The place is minutely described by Xenophon, and is easily identified on the maps, in some of which the port is marked Kirpe Liman (Kerpe Limanı). Apollonius

Apollonius of Rhodes

Apollonius Rhodius, also known as Apollonius of Rhodes , early 3rd century BCE – after 246 BCE, was a poet, and a librarian at the Library of Alexandria...

 (Arg. il. 661) calls the river Calpe "deep flowing".