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Lewis, county, north-central New York state, U.S. It largely consists of a plateau region bisected roughly north-south by the Black River, with the Adirondack Mountains rising to the east. The hardwood trees of the plateau region give way to coniferous forests in the Adirondacks. Other major waterways are Lake Bonaparte and the Beaver, Moose, Indian, Independence, and Oswegatchie (west branch) rivers. In addition to Adirondack Park, which occupies the eastern border of the county, public...