|Location:||Big Basin Prairie Preserve, western Clark County.|
|Open:||no restrictions |
|As far as we know this information was accurate when it was published (see years in brackets), but may have changed since then.
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Big Basin and Little Basin are the two best known sinkholes in the Red Hills, a karst area at the southern border of Kansas. Big Basin is about 1,600 m in diameter and 30 m deep, Little Basin is about 256 m diameter and 10 m deep. Both are dolines, formed by underground solution and the collapse of the overlaying rocks. There are salt and gypsum beds more than 100 m deep below the surface, which are continually dissolved by the groundwater.