| Badlands 
                                National Park, in southwest South Dakota, United 
                                States preserves 244,000 acres of sharply eroded 
                                buttes, pinnacles and spires blended with the 
                                largest protected mixed grass prairie in the United 
                                States.
 The Badlands Wilderness protects 64,144 acres 
                                (25,958 ha) of the park as a designated wilderness 
                                area and is the site of the reintroduction of 
                                the black-footed ferret, the most endangered 
                                land mammal in North America.
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