The Slave River is a Canadian river that flows from the confluence of the Rivière des Rochers and Peace River in northeastern Alberta and empties into Great Slave Lake in the Northwest Territories.
The Slave River originates in the Peace-Athabasca Delta at the forks of Peace River and Rivière des Rochers, which drains the Athabasca River and Lake Athabasca. The Slave River flows north into the Northwest Territories and into the Great Slave Lake north of Fort Resolution. From there the water reaches the Arctic Ocean through the Mackenzie River.
The river is 2338 kilometres long and has a cumulative drainage area of 616,400 square kilometres