There's not much to say about this gorgeous, ocean-water filled sinkhole on the road between Ramlah and Sur, east of Muscat, except that it's in the middle of nowhere, very unexpected and a delightful place to swim!
Just off the main road in Tulum is a fantastic sinkhole with two areas of cave-in and caves in between. The stalagmites and stalactites are plentiful and there are even some friendly turtles and fish to accompany your dive or swim!