On the programme: The written stone and the little-known storey of “Theopolis”, the legend of a lost city; Mediterranean and pre-alpine vegetation on the ridges; 360° views over the Durance valley and the Alps; The astonishing geology of the Haute-Provence Geopark: Pierre Écrite gorge, inverted reliefs and huge limestone bars; Aperitif at sunset on the ridges and return at first light.

Difficulty: Level 3/5. 2h30 effective walking time and 330m positive ascent during the evening. This is an all-public hike at a leisurely uphill pace, on well-marked paths and tracks only, with no steep gradients. The summit of the Gâche ridge may be uncomfortable for those with a sense of heights, but the width of the ridge line means that it can be kept well away. Suitable for families with children; special activities can be arranged for them. Please let us know when you register.

Supervision - Group hikes (max 13 people), supervised by a mountain leader based in Sisteron. He will provide you with technical information and introduce you to the local environment. The itinerary may be modified according to weather conditions or participants' physical condition.

Essential equipment : - Ideally, mountain boots with crampons. Failing that, a pair of trainers - 1 suit suitable for walking (light, breathable clothing) - 1 water bottle (minimum 1L/person for the outing) - 1 cap or hat, sunglasses and sun cream - A small jumper in case of cool evenings - 1 technical waterproof windbreaker (Gore-tex type) or a k-way (depending on the weather).

Optional equipment : - Your own telephone or camera - Binoculars for observation - Hiking poles (if you're used to walking with them!)