Black holes are the only formations known in the world where microorganisms have increased the temperature of water - in Andros Black Hole it reaches 40°C. Approximately 300 m wide and up to 47 m deep round karst formation.
The second deepest water filled sinkhole in the world. Total depth of sinkhole is 339 m, lake is 319 m deep. On the surface of lake there are floating several round travertine islands. Lake is formed by volcanically heated acidic groundwater.
124 m deep, perfectly round, submerged, deep blue sinkhole in the middle of atoll. At the depth of 40 metres contains numerous stalactites which provide valuable information about the past of Earth climate.
Some of the oldest and most unique sinkholes in the world. Both sinkholes have formed in extremely resistant sandstone over the course of hundreds of millions of years. Bottom of sinkholes contains patches of unique rainforest with endemic, little explored species.
One of the largest sinkholes in the world with volume of 90 million m³, width 750 - 1000 m. Two perennial streams enter this sinkhole and disappear underground. This giant pit is especially impressive due to high perennial waterfalls falling into it.
Unique review of the largest sinkholes of the world - deepest, most capacious and most unusual ones. Tncludes table of world's largest naturally formed sinkholes which are well pronounced (f.e. NOT included gently sloping valleys e.g. mega-dolines) and at least 150 m deep.
Map of 10 most impressive sinkholes
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