Lake McConnell to have drained first into Lake Agassiz", an even larger lake to the southeast, "then into the Arctic Ocean via the Mackenzie River, then back into Lake Agassiz, and then back to the Arctic Ocean" at various times in its history. Either 8,300 or between 9,000 and 8,000 years ago, it divided to form Great Slave Lake and Lake Athabasca. These two and Great Bear Lake are considered its 'daughter' lakes. Lake McConnell Lake McConnell was a very large proglacial lake that existed in what is now Canada from 11,800 to 8,300 years ago. Other sources give starting and ending
Bistcho Lake Bistcho Lake Bistcho Lake is a large lake in north western Alberta, Canada. Bistcho Lake has a total area of (with islands area and water surface), and lies at an elevation of . It is the third largest lake in Alberta (or fourth if considering Lake Athabasca, which is partly in Saskatchewan). Bistcho Lake is located in the hydrographic basin of the Liard River, to which it is connected by the Petitot River. The waters of the lake drain to the Arctic Ocean through the Petitot, Liard and Mackenzie River. The Jackfish Point and Bistcho Lake indian reserves of the