Thlewiaza
The Thlewiaza drains Nueltin Lake and runs east across the barren grounds towards Hudson Bay. Its Dene name has been interpreted as the Little Fish River, a reference to the grayling in its waters. The lake and river belonged to a country travelled by caribou-hunting Dene and Inuit, whose journeys followed the great herds across the northern interior. Peter Fidler recorded a form of the river's name in 1809; an 1827 map placed it at the northeastern end of Nueltin Lake.