Detail of pingo in the Mackenzie Delta (near Tuktoyaktuk). The picture exemplifies that the pingo core is formed by massive injection ice. Photo: Lorenz King, August 8,1987
<a href="//commons.wikimedia.org/wiki/User:Matti%26Keti" title="User:Matti&amp;Keti">Matti&amp;Keti</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>