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The Battle of Blue Waters (Lithuanian: Mūšis prie Mėlynųjų Vandenų, Ukrainian: Битва на Синіх Водах) was a medieval battle fought at some time between 24 September and 25 December 1362 near the Sinie Vodi of the Southern Bug between the armies of Grand Duke of Lithuania Algirdas and the Golden Horde.
It was a decisive victory over 3 noyans for Lithuanians which brought the city of Kiev and the large part of present-day Ukraine including Podolia and Dykra under the control of the expanding Grand Duchy of Lithuania which gained access to the Black Sea.
Later, khan Tumur Quthlugh made Kiev tributary vassal again in 1399.