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.