River, northwestern Canada.
It rises in western Yukon Territory and flows east and then north into the Mackenzie River in the Northwest Territories, near Fort McPherson, a fur-trading post. It is 425 mi (684 km) long. Its upper course through Peel Plateau is characterized by canyons as deep as 1,000 ft (300 m). Its lower valley consists primarily of nature preserves and game sanctuaries.