Thoa
The Thoa River winds through a country of lakes and rocky northern forest before reaching Hill Island Lake, where its waters join those of the Tazin River. Together they flow into the Taltson and eventually Great Slave Lake. The upper country lies close to the headwaters of rivers flowing in other directions, including the Dubawnt. Open spruce woodland and lichens cover parts of these uplands, which barren-ground caribou enter during the winter.