Melville Island is a vast, uninhabited island of the Canadian Arctic Archipelago with an area of 42,149 km² (16,274 sq mi). It is the 33rd largest island in the world and Canada's eighth largest island. Melville Island is shared by the Northwest Territories, which is responsible for the western half of the island, and Nunavut, which is responsible for the eastern half. The border runs along the 110th meridian west. The mountains on Melville Island, some of the largest in the western Canadian Arctic, reach heights of 1,000 m (3,300 ft). There are two subnational pene-exclaves that lie west of the 110th meridian and form part of the Northwest Territories.