A pingo, also called a hydrolaccolith[1] or a bulgunniakh[2], is a mound of eart...

Pingo - Wikipedia

A pingo, also called a hydrolaccolith[1] or a bulgunniakh[2], is a mound of earth-covered ice found in the Arctic and subarctic that can reach up to 70 metres (230 ft) in height and up to 600 m (2,000 ft) in diameter. The term originated as the Inuvialukt...（以下省略）