Pothole lakes in northern Siberia (Russia). As the glaciers retreated during the last Ice Age, some

Pothole lakes in northern Siberia (Russia).As the glaciers retreated during the last Ice Age, some large chunksof ice broke off and became surrounded or buried by soil and rockdebris.  When one of these pieces of ice melted, it left behind adepression in the ground called a kettle, and when the kettlefilled with water, it became a kettle lake or pothole lake.This photo was taken next to the Gulf of Ob.  The bluer-colouredlakes are deeper and clearer than the more green-coloured ones. Rivers (top right and bottom left) cut shallowly into the permafrost. The landscape is mostly spongy peat bog, covered in shallow-growingvegetation such as moss that can survive the winters. -- source link

More pics about