Allegheny Islands Wilderness

Allegheny Islands Wilderness consists of seven islands scattered along the Allegheny River within the Allegheny National Forest. The islands are covered in river bottom forests dominated by sycamore, hickory, and silver maple trees across their combined protected area.

Congress designated these islands as a protected wilderness in 1984, establishing one of the nation's smallest such areas. Thompson Island holds significance from the Revolutionary War period, when American forces under Colonel Daniel Brodhead clashed with British and Iroquois fighters there.

Thompson Island contains traces of Revolutionary War events, where American soldiers under Colonel Daniel Brodhead encountered British and Iroquois forces.

Access to the islands requires a boat, since no bridges or marked trails connect them to the mainland. Visitors need to be comfortable with river conditions and have basic boating knowledge to explore this area safely.

Pennsylvania's tallest sycamore tree grows on one of the islands, reaching about 45 meters in height. This natural landmark stands out as a notable reference point within the river forest landscape.