The status of certain portions of the Arctic sea region is in dispute for various reasons. Canada, Denmark, Norway, Russia, and the United States all regard parts of the Arctic seas as national waters (territorial waters out to ) or internal waters. There also are disputes regarding what passages constitute international seaways and rights to passage along them. There is one single disputed piece of land in the Arctic—Hans Island—which is disputed between Canada and Denmark because of its location in the middle of a strait.