Pra (Russia)
The Pra (Russian: Пра) is a river in the Ryazan and Moscow Oblasts in Russia, a left tributary of the Oka.[1] It is 167 kilometres (104 mi) in length. The area of its basin is 5,520 square kilometres (2,130 sq mi).[2] The Pra River freezes up in late November and stays under the ice until April. References
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