Lake Claire is the largest lake which is entirely in Alberta

Alberta

Alberta is a province of Canada. It had an estimated population of 3.7 million in 2010 making it the most populous of Canada's three prairie provinces...

, 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 located entirely in Wood Buffalo National Park

Wood Buffalo National Park

Wood Buffalo National Park, located in northeastern Alberta and southern Northwest Territories, is the largest national park in Canada at . The park was established in 1922 to protect the world's largest herd of free roaming Wood Bison, currently estimated at more than 5,000...

, west of Lake Athabasca

Lake Athabasca

Lake Athabasca is located in the northwest corner of Saskatchewan and the northeast corner of Alberta between 58° and 60° N.-History:The name in the Dene language originally referred only to the large delta formed by the confluence the Athabasca River at the southwest corner of the lake...

. It lies between the mouths of Peace River

Peace River (Canada)

The Peace River is a river in Canada that originates in the Rocky Mountains of northern British Columbia and flows to the northeast through northern Alberta. The Peace River flows into the Slave River, a tributary of the Mackenzie River. The Mackenzie is the 12th longest river in the world,...

 and Athabasca River

Athabasca River

The Athabasca River originates from the Columbia Glacier of the Columbia Icefield in Jasper National Park in Alberta, Canada...

, and is part of the Peace-Athabasca Delta

Peace-Athabasca Delta

The Peace–Athabasca Delta is a large freshwater, inland delta in northeastern Alberta located where the Peace and Athabasca Rivers join the Slave River at the western end of Lake Athabasca.-Conservation :...

 system.
The lake has a total area of 1436 km² (554.4 sq mi), with 21 km² (8.1 sq mi) island area, and lies at an elevation of 213 m (698.8 ft). It is the largest lake located entirely within Albertan boundaries. Lake Athabasca, which straddles the border with Saskatchewan

Saskatchewan

Saskatchewan is a prairie province in Canada, which has an area of . Saskatchewan is bordered on the west by Alberta, on the north by the Northwest Territories, on the east by Manitoba, and on the south by the U.S. states of Montana and North Dakota....

, is larger.

The lake is fed by Birch River and McIvor River, and the lake system also contains Baril Lake and Mamawi Lake. The waters are discharged in the Peace River

Peace River (Canada)

The Peace River is a river in Canada that originates in the Rocky Mountains of northern British Columbia and flows to the northeast through northern Alberta. The Peace River flows into the Slave River, a tributary of the Mackenzie River. The Mackenzie is the 12th longest river in the world,...

, finding their way to the Arctic Ocean

Arctic Ocean

The Arctic Ocean, located in the Northern Hemisphere and mostly in the Arctic north polar region, is the smallest and shallowest of the world's five major oceanic divisions...

 through the Slave River

Slave River

The Slave River is a Canadian river that flows from Lake Athabasca in northeastern Alberta and empties into Great Slave Lake in the Northwest Territories....

, Great Slave Lake

Great Slave Lake

Great Slave Lake is the second-largest lake in the Northwest Territories of Canada , the deepest lake in North America at , and the ninth-largest lake in the world. It is long and wide. It covers an area of in the southern part of the territory. Its given volume ranges from to and up to ...

 and Mackenzie River

Mackenzie River

The Mackenzie River is the largest river system in Canada. It flows through a vast, isolated region of forest and tundra entirely within the country's Northwest Territories, although its many tributaries reach into four other Canadian provinces and territories...

.