A sinkhole in <a href="https://en.wikipedia.org/wiki/Oman" class="extiw" title="en:Oman">en:Oman</a>
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/35468134730@N01">Hendrik Dacquin</a> from Gent, Belgium
CC BY 2.0
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