Thompson's Island is a 60-acre (240,000 m2) alluvial island in the upper Allegheny River. It is located in Pleasant Township, Warren County, Pennsylvania, and is part of the Allegheny Islands Wilderness in Allegheny National Forest.
- Nature Tourism
- Forest County
- Mary Byrd Davis (23 January 2008). "Old Growth in the East: A Survey. Pennsylvania" (PDF). http://www.primalnature.org/ogeast/pa.pdf.
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