Lake Claire (Alberta) contains Baril Lake and Mamawi Lake. The waters are discharged in the Peace River, finding their way to the Arctic Ocean through the Slave River, Great Slave Lake and Mackenzie River. Lake Claire (Alberta) Lake Claire is the largest lake which is entirely in Alberta, Canada. It is located entirely in Wood Buffalo National Park, west of Lake Athabasca. It lies between the mouths of Peace River and Athabasca River, and is part of the Peace-Athabasca Delta system. The lake has a total area of , with island area, and lies at an elevation of . It is the largest
Mackenzie River and riparian habitat. There are 53 fish species in the basin, none of them endemic. The Mackenzie River has a similar range of fish fauna to the Mississippi River system. It is believed that the two river systems were connected during the Ice Ages by meltwater lakes and channels, allowing fish in the two rivers to interbreed. Fish in the Mackenzie River proper include the northern pike, several minnow species, and lake whitefish. Fish in the southern half of the watershed are genetically isolated from those of the northern half due to large rapids on the Slave River preventing fish