Chaudière shōdyĕrˈ [key], river, 115 mi (185 km) long, rising in Lac Mégantic, SE Que., Canada, near the Maine-Que. boundary and flowing generally N to the St. Lawrence River opposite the city of Quebec. A hydroelectric power plant at Chaudière Falls (130 ft/40 m high) supplies electricity to the Quebec city region.

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