Analysis of information sources in references of the Wikipedia article "List of islands of the United States by area" in English language version.
Isle Royale National Park preserves 132,018 acres (534.26 km2) of land-based wilderness
Padre Island comprises a total of 133,918 acres (541.95 km2) in Nueces, Kleberg, Willacy, Cameron, and Kenedy County, Texas.