The Dubawnt River flows north from the treeline through the huge Dubawnt Lake system to join the Thelon at Beverly Lake. The Kazan River flows north from Kasba Lake through the barrenlands to the southeast end of Baker Lake. It is richly endowed with rapids and huge lakes. It is not a river for beginners. The country is hilly, rounded, rolling Canadian Shield.
Eskers provide good hiking.
You can paddle the Kazan's entire 540 mile length. And the fishing along the Kazan is hard to beat. Shorter trips are available. The open tundra of Nunavut provides the backdrop to the ultimate hiking experience. You can see across the land, to observe wildlife.