In Northwest China discovered 49 sinkholes

Experts believe that they represent the world’s largest cluster of similar geological formations. Karst recesses located between 32 and 33 degrees North latitude, and occupy a total area of 600 square kilometers. The cluster includes one giant funnel 17 is a large and 31 having conventional dimensions. The largest crater in diameter is 520 meters and 320 meters deep.

A group of natural excavations, scientists were able to detect monitored five thousand square kilometers of territories. In the course of work geologists have also managed to open 50 cavities with a diameter of 50-100 meters and 50 natural caves.

Sinkholes are formed as a result of erosion by the waters of the underground rivers natural rocks. It can take up to 500 thousand years. Currently, world found about 130 similar geological structures.