it is known as a lake (Mackenzie Lake)
You are probably asking about Great Slave Lake. The question is vague however as the MacKenzie River is in the Northwest Territory.
The Athabasca River flows into Lake Athabasca. From there, it is on to the MacKenzie River.
The Mackenzie River is about 1,800 km long, flowing northwest from Great Slave Lake into Mackenzie Bay on the Beaufort Sea.
It start at Great Slave Lake and flows into Beaufort Sea which technically is the Arctic Sea.
Mackenzie River originates in Great Slave Lake, in the Northwest Territories, and flows north into the Arctic Ocean.
The Mackenzie River is located in the Northwest Territories in Canada. The river begins at the Great Salt Lake near Hay River in the Northwest Territories and travels north to the Mackenzie Delta. Finally it empties into the Arctic Ocean.
The longest river in Canada is the Mackenzie River in the Northwest Territories; flowing from Great Slave Lake to the Arctic Ocean. The St. Lawrence River flows from the Great Lakes to the Atlantic Ocean, and is the river with the most historical importance in Canadian history.
Great Slave Lake in Fort Providence is the source of the Mackenzie River. The river flows for 1,080 miles and empties into the Arctic Ocean.
Mackenzie
The Yukon River in Alaska. It stretches 1979 km through Alaska and Canada.
The Mackenzie River originates in the Great Slave Lake, Canada, in the Northwest Territories, and flows north into the Arctic Ocean.
No. Canada - Origin Great Slave Lake, in Northwest Territories Mouth Arctic Ocean. Oregon - The McKenzie River is a tributary of the Willamette River.