Lake Couchiching (/ˈkuːtʃətʃɪŋ/ KOO-chə-ching),^[1] from the Ojibwe gojijiing meaning "inlet", is a medium-sized lake in Central Ontario, Canada, separated from Lake Simcoe by a narrow channel.

Quick Facts Location, Coordinates ...

Lake Couchiching
Lake Couchiching at Orillia
Lake Couchiching
Location	Ontario, Canada
Coordinates	44°40′N 79°23′W
Basin countries	Canada
Max. length	16 km (9.9 mi)
Max. width	5 km (3.1 mi)
Surface area	33.75 km2 (13.03 sq mi)
Max. depth	12 m (39 ft)
Surface elevation	219 m (719 ft)
Islands	Chief, Horseshoe, Heron, Thistle, Bird, Nadie, Green, Portage, Ship, Shotgun, and Garnet
Settlements	Orillia

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Lakes Simcoe and Couchiching are popular spots for fishing in summer and ice fishing in winter.

Singer-songwriter Gordon Lightfoot paid homage to the lake in the song "Couchiching".

The Couchiching Institute on Public Affairs holds its annual conference on the shores of the lake every August. Camp Couchiching is also located near the lake.

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 kilometres (9.9 mi) long and slightly less than 5 kilometres (3.1 mi) wide. The city of Orillia is located on the narrow channel connecting this lake with Lake Simcoe.

In a 2012 study, the lake showed a microalgae density of 2.4 × 10^7/cm^2, with a high species diversity. The lake showed low total phosphorus and high organic carbon content, when compared to Lake Simcoe.^[2]

• Mnjikaning Fish Weirs