|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 1,600m in diameter and 30m deep, Little Basin is about 256m diameter and 10m deep. Both are dolines, formed by underground solution and the collapse of the overlaying rocks. There are salt and gypsum beds more than 100m deep below the surface, which are continually dissolved by the groundwater.