Lake Couchiching ( ), from the
Ojibwe gojijiing meaning "
inlet", is a medium-sized lake in Central
Ontario separated from
Lake Simcoe by a narrow channel. The
Trent-Severn Waterway enters Lake Simcoe by the
Talbot River and exits this lake by the
Severn River which empties into
Georgian Bay. The lake is 16 km long, slightly less than 5 km wide and fairly shallow with an average depth of six metres. The city of
Orillia is located on the narrow channel connecting this lake with Lake Simcoe.