After a relatively easy walk (30-40min) as far as the summit of the extinct volcano (817m), the 360° panoramic views are astounding: lava fields, collection of craters, fissures and glaciers. Paths at the foot of the hills venture into the black desert of smooth dunes, tunnels, craters and slopes colonised by green, grey and metallic moss. If you have come with your vehicle, head off via the track F 207 through an incredible landscape.