Calpas or Kalpas, also known as Calpe or Kalpe ( grc, Κάλπη) was a river of

ancient Bithynia Bithynia (; Koine Greek: , ''Bithynía'') was an ancient region, kingdom and Roman province in the northwest of Asia Minor (present-day Turkey), adjoining the Sea of Marmara, the Bosporus, and the Black Sea. It bordered Mysia to the southwest, Pa ...

draining into the

Pontus Euxinus The Black Sea is a marginal mediterranean sea of the Atlantic Ocean lying between Europe and Asia, east of the Balkans, south of the East European Plain, west of the Caucasus, and north of Anatolia. It is bounded by Bulgaria, Georgia, Roma ...

, between the

Psilis The Psilis ( grc, Ψίλις) or Psillis (Ψίλλις) was a river of ancient Bithynia that drained to the Pontus Euxinus The Black Sea is a marginal mediterranean sea of the Atlantic Ocean lying between Europe and Asia, east of the Balka ...

, from which it is 210

stadia Stadia may refer to: * One of the plurals of stadium, along with "stadiums" * The plural of stadion, an ancient Greek unit of distance, which equals to 600 Greek feet (''podes''). * Stadia (Caria), a town of ancient Caria, now in Turkey * Stadi ...

distant, and the

Sangarius River The Sakarya (Sakara River, tr, Sakarya Irmağı; gr, Σαγγάριος, translit=Sangarios; Latin: ''Sangarius'') is the third longest river in Turkey. It runs through the region known in ancient times as Phrygia. It was considered one of th ...

. Near its mouth was the port of

Calpe Calpe () or Calp () is a coastal municipality located in the ''comarca'' of Marina Alta, in the province of Alicante, Valencian Community, Spain, by the Mediterranean Sea. It has an area of and a population density of . The city lies at the foot ...

, through which

Xenophon Xenophon of Athens (; grc, wikt:Ξενοφῶν, Ξενοφῶν ; – probably 355 or 354 BC) was a Greek military leader, philosopher, and historian, born in Athens. At the age of 30, Xenophon was elected commander of one of the biggest Anci ...

passed on his retreat with the

Ten Thousand The Ten Thousand ( grc, οἱ Μύριοι, ''oi Myrioi'') were a force of mercenary units, mainly Greeks, employed by Cyrus the Younger to attempt to wrest the throne of the Persian Empire from his brother, Artaxerxes II. Their march to the Bat ...

. Xenophon describes it as about halfway between

Byzantium Byzantium () or Byzantion ( grc, Βυζάντιον) was an ancient Greek city in classical antiquity that became known as Constantinople in late antiquity and Istanbul today. The Greek name ''Byzantion'' and its Latinization ''Byzantium'' cont ...

and

Heraclea Pontica __NOTOC__ Heraclea Pontica (; gr, Ἡράκλεια Ποντική, Hērakleia Pontikē), known in Byzantine and later times as Pontoheraclea ( gr, Ποντοηράκλεια, Pontohērakleia), was an ancient city on the coast of Bithynia in Asi ...

on a promontory, part which projects into the sea is an abrupt precipice. The neck which connects the promontory with the mainland is only 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.

Apollonius of Rhodes Apollonius of Rhodes ( grc, Ἀπολλώνιος Ῥόδιος ''Apollṓnios Rhódios''; la, Apollonius Rhodius; fl. first half of 3rd century BC) was an ancient Greek author, best known for the ''Argonautica'', an epic poem about Jason and t ...

calls the river "deep flowing". It is identified with the modern Ilaflı Dere.

References

Geography of Bithynia Rivers of Turkey Kocaeli Province Ancient Greek geography {{Turkey-river-stub