The Balkans • A former name of the
Struma River (Struma Karasu) in Bulgaria and Thrace, northern Greece • A former name of the
Mesta/Nestos River (Mesta Karasu) in Bulgaria and northern Greece, forming the border between Greek Macedonia and Thrace • A former name of the
Haliacmon (İnce Karasu) in western Macedonia, northern Greece •
Karasu (Istanbul), a river in the greater Istanbul area of Turkey
Central Asia •
Qarasu River, a small river in northeast Iran feeding into the southeast corner of the Caspian Sea •
Kara-Suu (Aksy), a right tributary of the river Naryn in Aksy District, Kyrgyzstan •
Kara-Suu (Kara-Köl), a left tributary of the river
Naryn near Kara-Köl, Kyrgyzstan • Karasu, name of the last stretch of river
Shiderti, Kazakhstan •
Karasu (Koybagar), a river in Kostanay Region, Kazakhstan •
Karasu (Karasor), a river in Karaganda Region, Kazakhstan
Japan •
Karasu River (Gunma) in Gunma Prefecture, Japan
Turkey •
Karasu (Euphrates), the western of the two major sources of the Euphrates in Eastern Anatolia •
Karasu (Hatay), a tributary of the Orontes River (formerly of Lake Amik) in Hatay Province, southeastern Turkey, bordering Syria • A small river in northwest Anatolia, a tributary of the
Sakarya River ==Town and villages==