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Somerset, county, west-central Maine, U.S. It consists of a mountain-and-plateau region bordered by Quebec, Canada, to the northwest and drained by the Moose and Kennebec rivers. Other waters include Flagstaff, Seboomook, and Brassua lakes. The Appalachian National Scenic Trail traverses the county between Bigelow Preserve on the west and Bald Mountain on the east. Major forest types are spruce, fir, maple, birch, and aspen. Somerset county was organized in 1809 and named for Somerset, England....