Betsiamites bĕrˌsĭmēˈ [key], river, c.240 mi (390 km) long, rising in the highlands of E Que., Canada, and flowing SE into the St. Lawrence River at Betsiamites. Two hydroelectric plants provide power; Bersimis Dam (1,050,000-kW capacity; completed 1956) impounds Lake Pipmuacan.

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