Lake Athabasca sand dunes

The Athabasca Sand Dunes are a unique geological feature located in northwest Saskatchewan on the south shore of LAKE ATHABASCA. The region of dunes stretches for 100 km in a narrow strip along LAKE ATHABASCA from the Alberta border east to Richards Lake. The dunes reach heights of 30 metres and vary in length from 400 to 1,500 metres. The Athabasca Sand Dunes comprise the largest area of active sand dunes in North America, and are the most northerly active dunes in the world. The dunes were formed roughly 8,000 years ago during the last glacial period. When the ice-sheet retreated from the area, meltwater channels and spillways (such as the valleys of the present-day William and MacFarlane rivers) washed great volumes of sand and sediment into Glacial Lake Athabasca.
(Extract from Encyclopedia of Saskatchewan.)

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