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Tioga, county, northern Pennsylvania, U.S., bordered by New York state to the north and Lycoming Creek to the southeast. It consists of a mountainous region on the Allegheny Plateau. The principal waterways are the Cowanesque and Tioga rivers and Crooked, Pine, and Babb creeks, as well as Hammond, Tioga, and Cowanesque lakes. Parklands include Hills Creek, Colton Point, and Leonard Harrison state parks as well as Tioga State Forest and Pine Creek Gorge (sometimes called...