Adirondack Mountains

Adirondack Mountains, between Lakes Champlain and Ontario, in the State of New York, U.S.A. They consist chiefly of granitic masses, with extensive forest growths, rising from a plateau 2,000 feet above the level of the sea. The highest summit, Mount Marcy, attains 5,337 feet. The Hudson river and the Richelieu river have their sources here.