Nueltin Lake straddles the Manitoba—Nunavut border in Canada. The lake, which has an area of 2,279 km2 (880 sq mi), is predominantly in Nunavut's Kivalliq Region, and on the Manitoba side there is the Nueltin Lake Airport which serves the fishing lodge. The lake is split into two parts by a set of narrows. It is drained by the Thlewiaza River.