Ivanhoe Lake is a 25 kilometres (16 mi) long, narrow lake

Lake

A lake is a body of relatively still fresh or salt water of considerable size, localized in a basin, that is surrounded by land. Lakes are inland and not part of the ocean and therefore are distinct from lagoons, and are larger and deeper than ponds. Lakes can be contrasted with rivers or streams,...

 in the Unorganized North Part of Sudbury District in Northeastern

Northeastern Ontario

Northeastern Ontario is the region within the Canadian province of Ontario which lies north and east of Lakes Superior and Huron.Northeastern Ontario consists of the districts of Algoma, Sudbury, Cochrane, Timiskaming, Nipissing and Manitoulin; and the single-tier municipality of Greater...

 Ontario

Ontario

Ontario is a province of Canada, located in east-central Canada. It is Canada's most populous province and second largest in total area. It is home to the nation's most populous city, Toronto, and the nation's capital, Ottawa....

, Canada

Canada

Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...

. It is on the Ivanhoe River

Ivanhoe River

The Ivanhoe River is a river in Cochrane District and Sudbury District in Northeastern Ontario, Canada. The river is in the James Bay drainage basin and is a left tributary of the Groundhog River.-Course:For a map showing the river course, see this reference....

 in the James Bay

James Bay

James Bay is a large body of water on the southern end of Hudson Bay in Canada. Both bodies of water extend from the Arctic Ocean. James Bay borders the provinces of Quebec and Ontario; islands within the bay are part of Nunavut...

 drainage basin

Drainage basin

A drainage basin is an extent or an area of land where surface water from rain and melting snow or ice converges to a single point, usually the exit of the basin, where the waters join another waterbody, such as a river, lake, reservoir, estuary, wetland, sea, or ocean...

 and is located 8 kilometres (5 mi) southwest of Foleyet on Ontario Highway 101. The lake is substantially encompassed by Ivanhoe Lake Provincial Park

Ivanhoe Lake Provincial Park

Ivanhoe Lake Provincial Park is an operating natural environment class park and protected area in the Unorganized North Part of Sudbury District in Northeastern Ontario, Canada...

, except for some private cottages at the northeast end of the lake.

Hydrology

There are four islands in the lake: First island, Second island, Hinton Island, and Klose Island; and one shoal, Hastle Shoal, located 500 metres (1,640 ft) northeast of Second Island).

The primary inflow is the Ivanhoe River at the southwest tip of the lake; other named inflows are (left and right tributaries vis-à-vis the Ivanhoe River inflow and outflow) Jackpine Creek (left), Hellyer Creek (left) and Gullystone Creek (right). The primary outflow is the Ivanhoe River (New Channel) at the northeast of the lake, controlled by the Ontario Ministry of Natural Resources

Ministry of Natural Resources (Ontario)

The Ministry of Natural Resources is a government ministry of the Canadian province of Ontario that responsible for Ontario’s provincial parks, forests, fisheries, wildlife, mineral aggregates and the Crown lands and waters that make up 87 per cent of the province...

-operated Ivanhoe Lake Dam, a barrage dam

Barrage (dam)

A barrage is a type of dam which consists of a line of large gates that can be opened or closed to control the amount of water passing the dam. The gates are set between flanking piers which are responsible for supporting the water load...

 to regulate the water level on the lake and headwaters storage for hydroelectric generating stations further downstream in the drainage basin. A secondary outflow is the Ivanhoe River (Old Channel) at the northwest of the lake. Both channels recombine further upstream as the Ivanhoe River, which flows via the Groundhog River

Groundhog River

The Groundhog River is a river in Cochrane District and Sudbury District in Northeastern Ontario, Canada. The river is in the James Bay drainage basin and is a left tributary of the Mattagami River.-Course:...

, Mattagami River

Mattagami River

The Mattagami River is a river in the James Bay drainage basin in Cochrane District, Timiskaming District and Sudbury District in Northeastern Ontario, Canada....

 and Moose River

Moose River (Ontario)

The Moose River is a Canadian river in the Hudson Plains ecozone of northern Ontario which flows 100 km northeast from the junction of the Mattagami and Missinaibi Rivers into James Bay. Its drainage basin is 108,500 km² and it has a mean discharge rate of 1370 m³/s. Its full length...

 to James Bay.

Transportation

The lake can be accessed by road from Highway 101, and private floatplane

Floatplane

A floatplane is a type of seaplane, with slender pontoons mounted under the fuselage; only the floats of a floatplane normally come into contact with water, with the fuselage remaining above water...

 services are offered by Air Ivanhoe from their main base on the lake. There is also an abandoned air strip between the northwest tip of the lake and Highway 101.