Great Slave Lake () is the second-largest lake in the Northwest Territories of Canada. It is the deepest lake in North America at 614m, and the ninth-largest lake in the world. It is long and wide. It covers . The lake shares its name with the Slavey First Nations. Towns on the lake include: Yellowknife, Hay River, Behchoko, Fort Resolution, Lutselk'e, Hay River Reserve, Dettah and N'Dilo.