Hudson River Skyline (photo)

The Hudson River is a 315-mile (507km) watercourse that flows from north to south primarily through eastern New York State in the United States. The river originates at Henderson Lake in Newcomb, New York, in the Adirondack Park, flowing southward past the state capital at Albany, and eventually forming the boundary between New York City and the U.S. state of New Jersey at its mouth, before emptying into Upper New York Bay. The official hydrologic source of the Hudson River is Lake Tear of the Clouds in the Adirondack Mountains. The lower half of the river is a tidal estuary occupying the Hudson Fjord, which formed during the most recent period of North American glaciation, estimated at 26,000 to 13,300 years ago.