Original: Geographical features include Great Bear Lake, the largest lake entirely within Canada,Great Bear Lake Keller Lake and Great Slave Lakes, as well as the Mackenzie River and the canyons of the Nahanni National Park Reserve, a national park and UNESCO World Heritage Site.
Simplified: The Northwest Territories have many geographical features, like the Great Bear Lake, the Mackenzie River and Nahanni River, which is a national park and a UNESCO World Heritage Site.