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county, east-central Pennsylvania, U.S., located west of the city of Allentown and bordered to the south by Blue Mountain. It consists of a rugged ridge-and-valley terrain that includes Mahantango, Broad, Sharp, and Second mountains. The county is drained by the West Branch Schuylkill and Little Schuylkill rivers and Mahanoy, Catawissa, Mahantango, and Swatara creeks. Recreation areas include Tuscarora, Locust Lake, and Swatara state parks and the Appalachian National Scenic Trail, which runs along the southern border