Badlands' undulating expanse of native prairie spreads over nearly quarter a million acres. Its name derives from the impassable jumble of gullies, buttes, pinnacles, and spires that gouge its surface. The exotic landforms, rich colors, and changing skies beckon the landscape. Badlands offer easy access to two adjoining parks: Wind Cave National Park and Custer State Park. These are strongholds for prairie megafuna--bison, pronghorn, mule and white-tailed deer, and coyote, plus a plethora of playful prairie dogs.