The Fosses de Fournès is a clay landscape made up of soft "pitons" composed of white clay marl 10 to 30m high, which have been formed by erosion. A multitude of furrows are gouged out of the slopes leading to bowl-shaped formations which are sometimes referred to as the "devil's stew pots".
The flat areas lay under lawns of Brachypodium* and thyme.
Fosses de Fournès is a valuable site in terms of the flora and fauna which it harbours and feeds. Kermes oaks, wild lavender and rosemary mingle in the clay landscape. It is possible to observe holes in the clay which house the nests of European bee eaters (also known as African hunters), a type of orange-blue bird present between mid-April and August. The presence of this bird contributes to the diversity of this agricultural landscape.
*Brachypodium: a type of grass