Zeya (zāˈä, Rus. zyāˈə) [key], river, c.800 mi (1,290 km) long, rising in the Stanovoy Range, Russian Far East, and flowing south to join the Amur River at Blagoveshchensk. It carries gold in its upper reaches, and its basin has gold, graphite, and lignite deposits. The lower course flows through the rich agricultural Zeya-Bureya Plain. A reservoir and dam at Zeya provide hydroelectric power for the region.