Klyazma River

Map of the Volga watershed with the Klyazma highlighted

The Klyazma River (Russian: Клязьма) is a river in the Moscow, Nizhny Novgorod, Ivanovo and Vladimir Oblasts in Russia, a left tributary of the Oka River.

The length of the river is 686 kilometres. The area of its drainage basin is 42,500 km². The Klyazma River usually freezes up in November and stays under the ice until mid-April, although in faster moving stretches ice-free water occurs until the air temperature drops below minus 10 °C.

Its main tributaries are the Ucha, Vorya, Kirzhach, Peksha, Nerl, Uvod, Teza, Lukh, Sudogda and Suvoroshch.

The Klyazma is navigable within 120 km from its estuary and in the area of the Klyazminskoye Reservoir. The cities of Gorokhovets, Mendeleyevo, Pavlovsky Posad, Vladimir, Kovrov, Shchyolkovo, Losino-Petrovsky, Noginsk, Orekhovo-Zuyevo, Sobinka and Vyazniki are located on the shores of the Klyazma River.