Sistema Zacaton

El Zacaton sinkhole, Mexico

Unique karst field created by thermal acidic waters heated by volcanic heat. Contains the world’s deepest water-filled sinkhole, the 339 meters deep El Zacatón sinkhole with 319 meters deep lake, and floating islands. Poza Seca is one of the unique travertine capped sinkholes of Sistema Zacatón – here the formerly open sinkhole has sealed itself with a limestone lid. Most likely it hides unknown life forms, not investigated.

Poza del Caracol, Sistema Zacaton

One of the prominent features of the unique Sistema Zacatón is Poza del Caracol – small, very deep sinkhole that is not fully explored.

Uet era Ongael

Small marine lake (0.9 ha) with its own subspecies of jellyfish Mastigias cf. papua remengesaui.

Clear Lake

Marine lake (3.9 ha) with its own subspecies of jellyfish Mastigias cf. papua salii.

Goby Lake

Round marine lake (2.1 ha) with its own subspecies of jellyfish Mastigias cf. papua nakamurai.

Uet era Ngermeuangel

Marine lake (4.3 ha) with its own subspecies of jellyfish Mastigias cf. papua remeliiki and Moon Jellyfish Aurelia sp.

Jellyfish Lake

Jellyfish Lake from air with swarms of jellyfish visible, Palau

A unique marine lake with an area of 5.0 ha, has an underground connection to the sea. Stratified in two layers that do not mix. Isolated from the sea 12,000 years and contains a distinct population of two species of jellyfish – endemic Mastigias cf. papua etpisoni and most likely endemic Aurelia sp. Millions of these jellyfishes make strict daily migration around the lake. Four more marine lakes with jellyfish on the nearby islands but Jellyfish Lake is the only one open to tourists. The number of jellyfish has reached up to 31 million (January 2005), currently some 5 million.