Uchan-su ( uk, Учан-Су, russian: Уча́н-Су or Водопадная Vodopadnaya, crh, Uçan Suv), is a river that flows in the South Coast of

Crimea Crimea, crh, Къырым, Qırım, grc, Κιμμερία / Ταυρική, translit=Kimmería / Taurikḗ ( ) is a peninsula in Ukraine, on the northern coast of the Black Sea, that has been occupied by Russia since 2014. It has a p ...

. The name translates from the Crimean Tatar language for '' 'swift water' ''. The river runs into the

Black Sea 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, Rom ...

in the center city of Yalta. It begins at the foot of Ai-Petri, flows upstream the gorge and then at a distance of from the source forms the Uchan-su waterfall, located at an altitude of and consists of several levels (the height of the waterfall is ). The river water is used extensively for water supply and irrigation.

See also