Karasu is a municipality and district of Sakarya Province, Turkey.

[1] It is on the Black Sea coast, and its population increases in the summer due to tourism.

The Acarlar Floodplain Forest is located partly in Karasu.

[4] Historically, Karasu has produced zinc and lead, whose mining started here in 1898.

This geographical article about a location in Sakarya Province, Turkey is a stub.