Imatra ĭm´äträ [key], falls in the Vuoksijoki River, SE Finland, between Lake Saimaa (Finland) and Lake Ladoga (Russia). The river descends 60 ft (18 m) in a series of rapids c. 1⁄2 mi (.8 km) long. The hydroelectric station there supplies power to all of S Finland. Imatra is a tourist attraction.

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