The Mackenzie delta is an area with thick continuous permafrost. However, unfrozen areas (taliks) may exist below the lakes shown. In the foreground, a small lake has been drained due to erosion (close to the coast). Ice-wedge polygons along contraction cracks slowly developed due to yearly freezing and melting cycles. This lake shows large low-centered polygons, more polygons can be recognized also between other lakes. Photo: Lorenz King, JLU_Giessen.de, August 7,1987
<a href="//commons.wikimedia.org/wiki/User:Matti%26Keti" title="User:Matti&amp;Keti">Matti&amp;Keti</a>
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