This wonder of nature has fascinated me since I first heard of them. It’s a mound of earth covered ice, formed at the edge of past glacial activity. Pingo is a Inuvialuktun word meaning small hill. The term is also used for ponds that either melted, or have not formed a mound.
They are located on permafrost and of course as these systems collapse so will these amazing creations of nature. Here is a video that describes how they form and some recent discoveries. 5:31 min
There is also an underwater version called a gas hydrate Pingo here is a silent video.4:04 min