The 8,500-acre Cook Forest State Park and 3,136-acre Clarion River Lands lie in scenic northwestern Pennsylvania.Known for its stands of old growth forest, the park’s Forest Cathedral of towering white pines and hemlocks is a National Natural Landmark.A scenic 13-mile stretch of the Clarion River flows through Cook Forest State Park and is popular for canoeing, kayaking, and tubing.Clear Creek State Park is only 11 miles away.