Which rivers are the largest tributaries of the Mackenzie River system?

The Mackenzie River system is fed by several major tributaries that drain vast regions of northwestern Canada. The largest of these include:

• Peace River: With a drainage basin of approximately 116,800 square miles (302,500 square km), it is a primary headwater of the system.1
• Liard River: This river drains an area of about 107,000 square miles (277,100 square km).1
• Athabasca River: This tributary drains a basin of roughly 36,800 square miles (95,300 square km).1

These rivers, along with various smaller streams flowing from the Canadian Shield, contribute to the massive drainage pattern of the Mackenzie River basin, which is the largest in Canada.1