With the exception of the semi-arid steppe of the south-eastern section, the province has adequate water resources. There are numerous rivers and lakes used for swimming, fishing and a range of water sports. There are three large lakes, Lake Claire () in Wood Buffalo National Park, Lesser Slave Lake (), and Lake Athabasca () which lies in both Alberta and Saskatchewan. The longest river in the province is the Athabasca River which travels from the Columbia Icefield in the Rocky Mountains to Lake Athabasca.