Nahanni National Park Reserve in the Dehcho Region of the Northwest Territories, Canada, approximately west of Yellowknife, protects a portion of the Mackenzie Mountains Natural Region. The centrepiece of the park is the South Nahanni River. Four noteworthy canyons reaching in depth, called First, Second, Third and Fourth Canyon, line this spectacular whitewater river. The name Nahanni comes from the indigenous Dene language name for the area; Nahʔa Dehé, which means "river of the land of the Nahʔa people".