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Uchan-su (Ukrainian: Учан-Су, Russian: Уча́н-Су or Водопадная Vodopadnaya , Crimean Tatar: Uçan Suv), is a river that flows in the South Coast of Crimea. The name translates from the Crimean Tatar language for 'swift water' .

Uchan-su Vodopadnaya
Uchan-su river in Yalta, Crimea
Physical characteristics
 ⁃ locationAi-Petri
Basin sizeBlack Sea

The river runs into the Black Sea in the center city of Yalta. It begins at the foot of Ai-Petri, flows upstream the gorge and then at a distance of 2 km (1.2 mi) from the source forms the Uchan-su waterfall, located at an altitude of 390 meters (1,280 ft) and consists of several levels (the height of the waterfall is 98 meters (322 ft)).

The river water is used extensively for water supply and irrigation.

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