Hudson River Hudson River The Hudson River is a river that flows from north to south primarily through eastern New York in the United States. The river originates in the Adirondack Mountains of Upstate New York, flows southward through the Hudson Valley, and eventually drains into the Atlantic Ocean at New York Harbor, between New York City and Jersey City. The river serves as a political boundary between the states of New Jersey and New York at its southern end. Further north, it marks local boundaries between several New York counties. The lower half of the river is a tidal estuary, deeper
New York (state) arises as a cuesta east of Lake Ontario. "Upstate" and "downstate" are often used informally to distinguish New York City or its greater metropolitan area from the rest of New York State. The placement of a boundary between the two is a matter of great contention. Unofficial and loosely defined regions of Upstate New York include the Southern Tier, which often includes the counties along the border with Pennsylvania, and the North Country, which can mean anything from the strip along the Canada–US border to everything north of the Mohawk River. New York contains a part of the Marcellus shale,