A horseshoe-shaped bay, approximately 1050 km (650 mi) wide and 1370 km (850 mi) long, stretching from the Canadian provinces of Quebec and Ontario in the south to the Northwest Territories. With a surface area of approximately 827,000 km² (320,000 mi²), Hudson Bay ranks twelfth in surface area among the Earth's seas and oceans. The bay is connected to the Arctic Ocean by the Foxe Channel and Roes Welcome Sound and to the Atlantic Ocean by the Hudson Strait (see illus.). Several islands are located within the bay, the largest of which is Southampton (41,212 km²; 15,912 mi²).