

The coussoul is a steppe-style pastoral lawn, whose rough vegetation grows on very fine soil. This soil covers pebbles from the old bed of the Durance. Less than a meter deep, there is a layer of pebbles, cemented naturally by a crust of mineral salts, called "pudding". Within the Petite Crau, it is possible to find spaces of coussouls well preserved, giving it an exceptional ecological richness.