The Northwest Passage is the circuitous sea passage, long sought by explorers, between the Atlantic and the Pacific Oceans. Though it was eventually found through a series of discoveries, it was not completely navigated until Norwegian explorer Roald Amundsen (1872 – 1928) explored it between 1903 and 1906. Numerous navigators, convinced of the existence of such a passage, attempted to find it during the early years of European westward sea exploration. Though unsuccessful, their determination led to the discovery of other important locations. French sailor and explorer Jacques Cartier found the St. Lawrence River, dividing Canada and the United States, between 1534 and 1535. English commander Sir Martin Frobisher discovered Frobisher Bay off the coast of Baffin Island and north of Quebec in 1576. English navigator John Davis discovered Davis Strait between Baffin Island and Greenland in 1587. English navigator Henry Hudson found the Hudson River in eastern New York State, and Hudson Bay, the inland-sea of central Canada, between 1609 and 1611. Following centuries of efforts Amundsen finally completed the first successful navigation of the Northwest Passage in September 1906, during a journey that lasted more than three years. The hash climate, however, makes the route impractical for commercial navigation.