Well it is not really an acro competition but mostly acro pilots take part in it. It's the ultimate competition of "waga" flying - the purely freestyle art of canopy control.
This unique event was first organized in 2003 by the well-known ParaTeam on the biggest dune in Europe, Dune du Pyla (near Bordeaux, France). The dune is 7km long, 110 meters high, and has a gorgeous view to the Atlantic.
Flying there is like having fun as children in a giant sandbox!