Access: From Arette, follow the D132 towards La Pierre-Saint-Martin. After about 6.5 km, park on the left on a grassy area at a place called La Mouline.
(S/E) From the car park, cross the Vert d’Arette ford and join the main track heading off to the left. Very soon, it climbs via wide hairpin bends through the Bois de l’Oumbré-det-Hourcq, offering a bit of shade if needed.
(1) Every other hairpin bend reveals beautiful views over the valley and the opposite hillside. Continue the climb through more open ground or along the edge of the woods
(2) You’ll reach the Cabane d’Auriste, situated in a vast meadow where cows graze alongside goats, which prefer the steeper areas. This spot, with its sweeping views into the distance, is the perfect place for a well-deserved break.
Continue along the path, which veers slightly to the right. Just before reaching the highest point, look out for a pile of puddingstone boulders on the left.
(3) From the summit of the Mail de Lerre, the view stretches towards the Pics d’Arlas and d’Anie beyond the Pierre Saint-Martin.
(4) When the path begins to descend, turn back to return via the same route but downhill (S/E).