Karst beauty

Virtually without comment. Just beautiful.
Lake Morning Delight (Morning Glory Pool) Yellowstone, USA

 
Ile-Kiel. Mexico. Wall height of 25 m, 50 m depth of the lake-

The failure of the Bimah, Oman. Karst, blue green water and wildly popular among tourists

Great Blue Hole. Located in the center of Lighthouse Reef, one of the atolls of Belize Barrier Reef.

Red Lake. Croatia.
This karst lake depth of 287 meters - the deepest lake in Europe.