Hudson Bay (Inuktitut: "Kangiqsualuk ilua" or "Tasiujarjuaq" ) (sometimes called Hudson's Bay, usually historically) is a large body of saltwater in northeastern Canada with a surface area of and is located entirely within Nunavut. Although not geographically apparent, it is for climatic reasons considered to be a marginal sea of the Arctic Ocean. It drains a very large area, about , that includes parts of southeastern Nunavut, Alberta, Saskatchewan, Ontario, Quebec, all of Manitoba and indirectly through smaller passages of water parts of the U.S. states of North Dakota, South Dakota, Minnesota, and Montana. Hudson Bay's southern arm is called James Bay.