Washington County is a county located in the U.S. state of New York. It is part of the Glens Falls, New York, Metropolitan Statistical Area. As of the 2010 census, the population was 63,216.[1] It was named for the Revolutionary War general (and later President of the United States) George Washington. The county seat is Fort Edward.

Washington County is a long narrow county located in the northeastern section of the State. It is known for its rich valley farm land and is part of the Great Appalachian Valley (also known simply as the ‘Great Valley’) which is a long narrow valley strip often between tall mountain ranges. The county transitions from the Taconic Mountains to the Adirondack Mountains, and from the Lake Champlain Valley to Hudson River Valley.

Much of the county is part of the slate valley of the Upper Taconic Mountains (Taghkanic, meaning ‘in the trees’). The eastern boundary of Washington County is the New York–Vermont border, part of which is Lake Champlain. This is also the border with New England proper. The northern end of the county is part of the Adirondack Mountains. Western boundaries include primarily the Hudson River and Lake George.

Washington County belongs to the following valleys and watersheds: Champlain Valley / Lake George Watershed—02010001 [4] Hudson River Valley / Hudson-Hoosic Watershed—02020003 [5] Waters in the northern part drain into Lake Champlain via Lake George (Horican) or the Mettawee River, and then flow into the Saint Lawrence River (Kaniatarowanenneh). These waters mingle in the Saint Lawrence with waters of all the Great Lakes as they flow northeast into the Gulf of Saint Lawrence, and ultimately join the Atlantic Ocean. Meanwhile, the remainder of waters drain south via the Hudson River (Muh-he-kun-ne-tuk or Muhheakantuck), and ultimately flow south into the Atlantic Ocean below New York City. See the approximation of the watershed divide mapped in context of mountains [1] and valleys [2].

http://en.wikipedia.org/wiki/Washington_County,_New_York