Vilyui [key], river, c.1,520 mi (2,450 km) long, rising in the central Siberian uplands, E Siberian Russia, in the Sakha Republic, and flowing east through an agricultural area into the Lena River. It is navigable for c.750 mi (1,210 km) upstream and abounds in fish. In the Vilyui basin there are deposits of diamonds, iron ore, coal, and gold. The Vilyui Range, which rises to 3,300 ft (1,006 m) separates the Lena and Olenek river basins.
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