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Vyazniki asv2019-05 img13 Klyazma River.jpg
Klyazma River at Vyazniki
Map of the Volga watershed with the Klyazma highlighted
Native nameКлязьма
Physical characteristics
 • coordinates
56°10′05″N 42°58′09″E / 56.16806°N 42.96917°E / 56.16806; 42.96917Coordinates: 56°10′05″N 42°58′09″E / 56.16806°N 42.96917°E / 56.16806; 42.96917
Length686 km (426 mi)
Basin size42,500 km2 (16,400 sq mi)
Basin features
ProgressionOkaVolgaCaspian Sea

The Klyazma (Russian: Клязьма, IPA: [ˈklʲæzʲmə], Klyaz'ma) is a river in the Moscow, Nizhny Novgorod, Ivanovo and Vladimir Oblasts in Russia, a left tributary of the Oka.[1]

The length of the river is 686 kilometres (426 mi). The area of its drainage basin is 42,500 square kilometres (16,400 sq mi).[1] The Klyazma 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 −10 °C (14 °F).

The largest tributaries of the Klyazma are, from source to mouth:[2]

The Klyazma is navigable within 120 kilometres (75 mi) 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.

The basin of Klyazma was the center of Vladimir-Suzdal land.