Simcoe, Lake, 539 sq mi (1,396 sq km), S Ont., Canada, between Georgian Bay and Lake Ontario. Cook Bay, Kempenfelt Bay, and Lake Couchiching are arms of the lake. Lake Simcoe drains N through the Severn River to Georgian Bay and forms part of the Trent Canal system. Orillia, Barrie, and several small resorts are on the lake.
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