- a large inland sea in N Canada. 850 miles (1,370 km) long; 600 miles (965 km) wide; 400,000 sq. mi. (1,036,000 sq. km).
- an inland sea in NE Canada: linked with the Atlantic by Hudson Strait; the S extension forms James Bay; discovered in 1610 by Henry Hudson. Area (excluding James Bay): 647 500 sq km (250 000 sq miles)
