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The Nerl River (Russian: Нерль) is a river in the Yaroslavl, Ivanovo, and Vladimir Oblasts in Russia, a left tributary of the Klyazma River (Volga's basin). The river is 284 kilometres (176 mi) long, and its drainage basin covers 6,780 square kilometres (2,620 sq mi). The Nerl River freezes up in November or December and stays under the ice until April. Its main tributary is the Ukhtoma River.
Coordinates: 56°11′33″N 40°34′40″E / 56.1924°N 40.5778°E