 Green Park, an incorporated village located in northeastern Tyrone Township, serves as Perry County's midpoint between the Conococheague Mountain in the west and the Susquehanna River to the east.The county terrain is formed by the folded Appalachian Mountain ridges which run from southwest to northeast across the county.The terrain slopes to the northeast, with its highest point on the Blue Mountain Ridge, which delineates the border between Perry and Cumberland counties.