Qatar
A 150m-deep cave not far from the Misfir Sinkhole. The mouth is about 15m wide and there is a pool of brackish water at the bottom, which was once used as a source of drinking water by the local Bedouin. The cave is now a popular geocache site.
Listen to the audio guide for Mudhlem Cave Free on WIP — starts by itself when you arrive, even with the screen off