Pra River (Russia)
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For other uses, see Pra River.
Pra River (Russian: Пра) is a river in the Ryazan and Moscow Oblasts in Russia, a left tributary of the Oka River. It is 167 km in length. The area of its basin is 5,520 km². The Pra River freezes up in late November and stays under the ice until April.