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Mountains in northeastern New York state, U.S. They extend south from the St. Lawrence River valley and Lake Champlain to the Mohawk River valley. The Adirondack region covers more than 6 million acres (2.4 million hectares). It has more than 40 summits higher than 4,000 ft (1,219 m); the tallest, Mount Marcy (5,344 ft [1,629 m]), is the state's highest. Samuel de Champlain became the first European to sight the Adirondacks in 1609. The area was sparsely settled when in 1892 the state legislature created Adirondack Park, which has grown over the years to become, at more than 5 million acres (2 million hectares), the largest U.S. state or national park outside of Alaska.
This entry comes from Encyclopædia Britannica Concise. For the full entry on Adirondack Mountains, visit Britannica.com.