Unique Sinkholes of Layla Saudi Arabia: hypogene karst ...
The gypsum tufa of Layla Lakes was a completely unexpected discovery. Heiko Dirks (a former MSc Student of mine) and I were on assignment in Saudi Arabia to look at a few sinkholes near As Sulayil. We found those, but they were not so interesting, since two had been filled by farmers and only one was new and actively sinking (even issuing hot air).