Lake Nipigon French: lac Nipigon; Ojibwe: Animbiigoo-zaaga'igan) is part of the Great Lakes drainage basin. It is the largest lake entirely within the boundaries of the Canadian province of Ontario.

Lying 260 metres (853 ft) above sea level, the lake drains into the Nipigon River and thence into Nipigon Bay of Lake Superior. The lake and river are the largest tributaries of Lake Superior. It lies about 120 kilometres (75 mi) northeast of the city of Thunder Bay, Ontario.

After the Treaty of Paris (1763), the area passed into the hands of the British, and the Hudson's Bay Company expanded its trading area to include the Lake. Although it was considered to be within British North America, it was not until 1850 that the watershed draining into Lake Superior was ceded formally by the Ojibwe Indians to the Province of Canada (see Robinson Treaty, 1850, also known as the Robinson Superior Treaty). A four square mile reservation was set aside on Gull River near Lake Nipigon on both sides of the river for the Chief Mishe-muckqua (from Mishi-makwa, "Great Bear"). In 1871 Lake Nipigon was included in the new Thunder Bay District, Ontario.

A Week Camping Alone on the Notorious Sixth Great Lake,
Lake Nipigon in Ontario

Special rules/regulations (From 2017 fishing Handbook)
Includes detailed map of the area

Surface Area: 4510 km2
Maximum Depth: 165 m
Mean Depth: 54.9 m
Shoreline Length: 1044 km

Geological Survey of Canada
Report of Progress for 1871-72 (pdf)

A Faunal Survey of the Lake Nipigon Region
By J. R. Dymond, L. L. Snyder, and E. B. S. Logier (1928) (pdf)

Nipigon to Winnipeg: a canoe voyage through Western Ontario
By Edward Umfreville in 1784. [external link]

Members of the Nipigon Indian Band
Met on Saturday November 10, 2011 to discuss their claim to reserve land around Mcintyre Bay on Lake Nipigon

Red Rock Indian Band [external link]

An interesting economic experiment at McIntyre Bay Reserve
Situated on the southwest shore of lake Nipigon, in the Port Arthur Indian Agency