World's largest cluster of sinkholes found in China
Researchers have uncovered a cluster of 49 sinkholes in northwest China, the largest cluster of natural sinkholes in the world. These sinkholes run along a 200-km-long 'karst' landform belt in the Qinling-Bashan Mountains, with the biggest of them deeper than the height of the Eiffel Tower and wider than the height of the Empire State Building.