Great Slave Lake
In Northern Canada. Area 10,719 square miles.
Discovered by Samuel Hearne (q.v.), in 1771. A post built there, 1786,
by Leroux and Grant, of the North West Company. Three years later
Alexander Mackenzie passed through the lake on his way to the mouth of
the Mackenzie River. Visited later by many other explorers and fur
traders, this being on the route to the far North and North-West.