The Pingos of Tuktoyaktuk.
A pingo, also called a hydrolaccolith, is a mound of earth with a core of ice found in the Arctic and subarctic regions, that can reach up to 70 meters in height and up to 600 meters in diameter.
Tuktoyaktuk in the Mackenzie Delta of the Northwest Territories in Canada has one of the highest concentrations of pingos, with some 1,350 examples. Pingo National Landmark protects eight of these features. Two of the most famous pingos are Ibyuk and Split. Ibyuk is about 50 meters high and is the tallest pingo in Canada and the second tallest in the world.