Named for the Slavey North American Indians, Great Slave Lake is the deepest lake in North American, with a maximum depth of 614 metres (2,015 feet). It is the second-largest lake in the Northwest Territories, smaller only than Great Bear Lake, and covers and area of approximately 28,400 square kilometres (10,965 square miles). With an estimated volume of 2,090 cubic kilometres (500 cubic miles), it stretches over 480 kilometres (298 miles) long and ranges from 19 to 109 kilometres (12 to 68 miles) wide. During the winter months, Great Slave Lake is frozen enough for large trucks to pass over it.