The changing face of Russia and geography.
River, southwestern Russia. Rising south of Moscow in the central Russian uplands, it flows generally south for 1,162 mi (1,870 km) to enter the Gulf of Taganrog in the Sea of Azov. In its middle course it flows into the Tsimlyansk Reservoir, which dominates the Don's lower course. Most of its basin is rich farmland and timberland. A major shipping artery, it is navigable (in the spring) as far as 990 mi (1,584 km) from the Sea of Azov.
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