Assertion: national park's acre | /r/HasProperty | 259.6 km2
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Source sentences:
text: The Badlands Wilderness protects 64,144 acres (100.2 sq mi; 259.6 km2) of the park as a designated wilderness area, and is one site where the black-footed ferret, one of the most endangered mammals in the world, was reintroduced to the wild.