North River is an alternate name for the southernmost portion of the Hudson River in the vicinity of New York City and northeastern New Jersey in the United States. The colonial name for the entire Hudson was given to it by the Dutch in the early seventeenth century, the term fell out of general use for most of the river's 300+ mile course during the early 1900s. However it still retains currency as an alternate or additional name among local mariners and others as well as appearing on some nautical charts and maps. The term is used for infrastructure on and under the river, such as the North River piers, North River Tunnels, and the North River Wastewater Treatment Plant.