The Mackenzie River is the longest river in Canada. It flows north and west for about a thousand miles from Great Slave Lake to the Beaufort Sea, a part of the Arctic Ocean. Many parts of the MacKenzie are more than a mile wide.
The MacKenzie River System includes tributaries such as the Liard, Great Bear, Arctic Red, and Peel rivers. Together, the system drains an area larger than Alaska, totalling about 682,000 square miles.
