Mackenzie River Great Slave Lake, at Fort Resolution, Northwest Territories. The Slave is by far the largest river flowing into the lake, with an annual flow of 108 km (87 million acre-feet). It contributes about 77% of the overall inflow, and forms a large delta where it enters the lake. Other rivers entering Great Slave Lake area the Taltson, Lockhart and Hay Rivers, the latter of which also extends into Alberta and BC. The Mackenzie River issues from the western end of Great Slave Lake about south-west of Yellowknife. The channel is initially several kilometres wide but narrows to about at Fort
Redknife River upstream from Jean Marie River. Redknife River The Redknife River is a river in the Northwest Territories of Canada. It is a major tributary of the Mackenzie River. The Redknife Formation, a stratigraphical unit of the Western Canadian Sedimentary Basin was named for the river. The Redknife river originates in the "Redknife Hills", at an elevation of . It flows east down the slopes of the hill, then turns north, draws water from a lake system, then turns north-east. It is crossed by the Mackenzie Highway, then turns north and flows into the Mackenzie River at an elevation of ,