This list of Hudson Bay rivers includes the principal rivers draining into the Hudson, James and Ungava bays of the Arctic Ocean. The total surface area of the Hudson Bay watershed is about 3,861,400 square kilometres (1,490,900 sq mi), with a mean discharge of about 30,900 m3/s (1,090,000 cu ft/s). The drainage basin includes parts of five Canadian provinces (Alberta, Saskatchewan, Manitoba, Ontario and Quebec), territories (Northwest Territories and Nunavut) and four American states (Montana, South Dakota, North Dakota and Minnesota). The two principal waterways are the La Grande Rivière, in Québec, and the Nelson River in Manitoba, each with an average waterflow of over 3,000 m3/s (110,000 cu ft/s).