The Karasu (Turkish for 'black water') is a short river in the
Istanbul metropolitan area; it flows into the lake formed by the
Büyükçekmece Dam
Büyükçekmece Dam ( tr, Büyükçekmece Barajı) is a dam on the Lake Büyükçekmece in Büyükçekmece district of Istanbul Province, Turkey. The development was backed by the State Hydraulic Works (Turkey), Turkish State Hydraulic Works (DSİ ...
. Anciently, the river was known as the Athyras ( grc, Ἀθύρας), and was considered a river of
ancient Thrace that flowed between
Selymbria and
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 ...
(the later Istanbul).
also calls it Pydaras.
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References
Rivers of Turkey
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