Longcanoe Lake is a narrow lake in Thunder Bay District

Thunder Bay District, Ontario

Thunder Bay District is a district and census division in Northwestern Ontario in the Canadian province of Ontario. The district seat is Thunder Bay....

, 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...

 about 15 kilometres (9 mi) north-east of the community of Rossport

Rossport, Ontario

Rossport is a locality on the north shore of Lake Superior in Thunder Bay District, Northwestern Ontario. A designated place served by a local services board, Rossport had a population of 66 in the Canada 2006 Census, a decrease of 41.1% since 2001.-History:...

 and 11 kilometres (7 mi) north of Highway 17

Highway 17 (Ontario)

King's Highway 17, more commonly known as Highway 17, is a provincially maintained highway and the primary route of the Trans-Canada Highway through the Canadian province of Ontario. It begins at the Manitoba border west of Kenora and ends south of Arnprior at the western terminus of Highway 417, ...

. It is oriented in a north-south direction and is about 1100 metres (3,609 ft) long and 250 metres (820 ft) at its widest, at its north end. The lake is part of the Whitesand River

Whitesand River (Hewitson River)

The Whitesand River is a river in Thunder Bay District, Ontario, Canada, part of the Hewitson River system. Another river in Thunder Bay District with the same name, Whitesand River , lies further northwest and flows into Lake Nipigon.-Course:...

 system and flows out at its south end via this river into Hornblende Lake

Hornblende Lake

Hornblende Lake is a lake in Thunder Bay District, Ontario, Canada. It is about long and wide, and lies at an elevation of . The primary inflow is the Whitesand River flowing downstream from Longcanoe Lake, and the primary outflow is also the Whitesand River, which flows downstream into Lyne Lake....

, and eventually via the Hewitson River

Hewitson River

The Hewitson River is a short river in Thunder Bay District, northwestern Ontario, Canada.-Course:The river begins at Whitesand Lake and flows over a series of falls, called the Rainbow Falls, then is crossed by Highway 17, and finally flows into Lake Superior. The mouth is about east of the...

 into Lake Superior

Lake Superior

Lake Superior is the largest of the five traditionally-demarcated Great Lakes of North America. It is bounded to the north by the Canadian province of Ontario and the U.S. state of Minnesota, and to the south by the U.S. states of Wisconsin and Michigan. It is the largest freshwater lake in the...

. A mine access road travels along the eastern shore of the lake.