At 21,122 acres, it is the largest state park in the Commonwealth. The 17,088-acre Pymatuning Reservoir is the largest lake in the Commonwealth. In its three campgrounds, Pymatuning has the most campsites in the state park system. But the biggest thing about Pymatuning is the fun you can have boating, fishing, swimming, camping and enjoying other recreational opportunities. In addition to the state park facilities, the PA Fish and Boat Commission operates a fish hatchery and the PA Game Commission has wildlife viewing areas.