Accessible only by boat, the 50-acre Allegheny Islands State Park consists of two alluvial islands and seven shoals in the Allegheny River. The park is heavily covered in vegetation and remains undeveloped. Some of the few islands left in a natural state, the islands are homes to many animals and plants and frequently flood.

The 14-acre upper island eastern is opposite the mouth of Black Run and east of C.W. Bill Young Lock and Dam 3.

The 34-acre lower island western is west of the lock between the mouths of Falling Springs Run and Black Run.

There are no developed trails, however, several footpaths exist.

The park is open every day of the year, sunrise to sunset.

Located in Pennsylvania, the park consists of two alluvial islands spread over 43 acres. Established in 1980, it is completely undeveloped and accessible only by boat. The land was purchased from private owners to protect its natural state for future generations. It's home to a variety of wildlife species including birds and small mammals.