Hudson River Wikipedia. The Hudson River is a 315-mile (507 km) river that flows from north to south primarily through eastern New York. It originates in the Adirondack Mountains of Upstate New York and flows southward through the Hudson Vall…

WebHudson River, river in New York state, U.S. It flows almost entirely within the state, the exception being its final segment, where it forms the boundary between New York and New Jersey for 21 miles (34 km). The Hudson originates in several small postglacial lakes in the Adirondack Mountains near Mount Marcy (5,344 feet [1,629 metres]), the highest point in New York, and flows about 315 miles (507 km) through the eastern part of the state.