Located in the Maybelle River Wildland Park, 200 kilometres north of Fort McMurray, the Athabasca Sand Dunes Ecological Reserve is the province's largest Ecological Reserve and contains part of Alberta's largest active sand dune system. This section of the dunes is approximately eight kilometres in length and 1.5 kilometres wide and features 12-metre tall sand dunes and 60 metre high kames which are among the largest in the world. Shifting up to 1.5 metres a year, these powerful dunes are slowly migrating south, burying jack pine forests and filling in small lakes, leaving behind a flat, barren plain. Birdwatchers take note, Arctic terns, not known to nest elsewhere in Alberta, can be seen nesting in the reserve.