El Zacaton sinkhole

El Zacaton and Nacimiento spring

The second deepest water-filled sinkhole in the world. The total depth of the sinkhole is 339 m, the lake is 319 m deep. On the surface of the lake, there are floating several round travertine islands. Lake is formed by volcanically heated acidic groundwater.

Sotano del Barro

Sótano del Barro, Mexico

One of the largest sinkholes of the world, 455 m deep, with 410 m direct fall. Width – 420 m, formed in Lower Cretaceous limestone.

Hoya de las Guaguas

Hoya de las Guaguas sinkhole, Mexico

Sinkhole – cave of giant size. Entrance shaft is 202 m deep, total depth 478 m, cave chamber up to 290 m tall. Thousands of swifts and parrots live in the sinkhole.

Poza Seca, Sistema Zacaton

One of the unique travertine capped sinkholes in Sistema Zacatón: formerly open sinkhole has sealed itself with a limestone lid. Most likely it hides unknown life forms, not investigated.

Naré sinkhole

Cross section of Naré sinkhole (Papua New Guinea, compared with Boeing 747-400

One of the most spectacular sinkholes in the world, also located in an exotic jungle. Up to 310 meters deep, up to 150 meters across, volume – 4.7 million m³. Walls are overhanging, below flows a powerful river. At the top part of the sinkhole, inside it often is seen clouds. The further cave reaches 415 m depth.

Mamo plateau

Unique landscape – here close together are located more than 100 giant sinkholes, up to 600 m wide and up to 420 m deep (Uli Malemuli sinkhole). The volume of the largest sinkholes reaches 31 million m³, their walls though are not vertical. Numerous waterfalls are falling into sinkholes.