Piedras Negras vs Novocherkassk

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Novocherkassk (Russian: Новочерка́сск, lit. New Cherkassk) is a city in Rostov Oblast, Russia, located near the confluence of the Tuzlov and Aksay Rivers, the latter a distributary of the Don River. Novocherkassk is best known as the cultural capital of the Cossacks, and as the official capital of the Don Cossacks.

Population: 168,746 (2010 Census); 170,822 (2002 Census); 187,973 (1989 Census); 178,000 (1974); 123,000 (1959); 81,000 (1939); 52,000 (1897).

Source: Wikipedia