The Klyazma (p=ˈklʲæzʲmə, Klyaz'ma or Kliazma), a river in the Moscow Oblast, Nizhny Novgorod, Ivanovo Oblast and Vladimir Oblast in Russia, forms a left tributary of the Oka.[ Клязьма, Great Soviet Encyclopedia]
The long river's drainage basin is .[ 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 .
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The largest tributaries of the Klyazma include (from source to mouth):[ «Река ОЗЕРО МАЛЫЕ ПОДБОРЦЫ», Russian State Water Registry]
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Ucha (left)
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Vorya (left)
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Sherna (left)
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Kirzhach (left)
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Peksha (left)
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Polya (right)
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Koloksha (left)
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Nerl (left)
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Sudogda (right)
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Nerekhta (right)
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Uvod (left)
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Teza (left)
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Lukh (left)
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Suvoroshch (right)
The Klyazma is navigable within 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 stand on the shores of the Klyazma River.
The basin of the Klyazma formed the center of the Vladimir-Suzdal in the 12th to 14th centuries CE.