<a href="https://en.wikipedia.org/wiki/Sinkhole" class="extiw" title="en:Sinkhole">Sinkhole</a> in <a href="https://en.wikipedia.org/wiki/Muschelkalk" class="extiw" title="en:Muschelkalk">Muschelkalk</a> (shellbearing <a href="https://en.wikipedia.org/wiki/limestone" class="extiw" title="en:limestone">limestone</a>) <a href="https://en.wikipedia.org/wiki/karst" class="extiw" title="en:karst">karst</a>, between <a href="https://en.wikipedia.org/wiki/Bad_Berka" class="extiw" title="en:Bad Berka">Bad Berka</a> and <a href="https://de.wikipedia.org/wiki/Saalborn" class="extiw" title="de:Saalborn">Saalborn</a>, <a href="https://en.wikipedia.org/wiki/Thuringia" class="extiw" title="en:Thuringia">Thuringia</a>, Germany
<a href="//commons.wikimedia.org/wiki/User:KaiKemmann" title="User:KaiKemmann">KaiKemmann</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>