Don

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Don River of sw Russia. Rising se of Tula, it flows s, then sw to the Sea of Azov. Rostov is the major port. Annual floods are controlled by the Tsimlyansk Reservoir. The Don is navigable for 1370km (850mi), and is an important shipping route for grain, timber and coal. It is linked by canal to the River Volga. Length: 1930km (1200mi).