Pass the hamlet of Léouvé north of La Croix-sur-Roudoule and park at marker 239 marked: Parking départ des randonnées (hiking trailhead car park).
(S/E) Follow the signs for Col de Roua. Basse and Haute Mihubi, taking the tarmac road to start this activity gradually. Reach marker 240. Turn right onto the historic uphill path, which is an ancient Roman road. Pass below a house.
Reach the shuttle turnaround area. Continue along the wide, cemented path at the start, then along the dirt path. Follow the path to reach the Ruisseau du Vallon de Garnier stream.
(1) Continue straight ahead and keep climbing until you reach the Col de Roua at marker 250. Enjoy the superb panoramic view here.
(2) Turn right towards Mihubi - Col de Sui. Continue along the path which crosses areas of marl and reddish rocks. Alternate between yellow markings and cairns. Reach the Basse Mihubi crossroads.
(3) Continue straight ahead, passing the south side of the building. Follow a terraced field, then cross another area of reddish rocks and pastures. Reach the hamlet of Haute Mihubi, then marker 253.
(4) Turn left and pass between the mountain houses in a grassy area. Veer slightly to the right. Stay alert, as alternating yellow markings and cairns are essential on this uphill trail. Come out at the high point at Col de Sui. Be careful here: this is a windy area with exceptional scenery.
(5) Turn left to rejoin the track and then left again to pass under the Tête de Mélèze. Follow this very pleasant downhill path and you will soon come to the Roche Castel ridge at a bend.
(6) Leave the path at this bend. Continue straight ahead off the path along the ridge line to easily reach the summit of Roche Castel.
(7) Walk as close as possible to the rock on the south side and follow a beautiful path that is not marked on the map. Pass under the towers of Castel. Continue along this path until you reach a large clearing at the crossroads of carriage roads.
(8) Pay attention: the start of the path is not marked. Climb up to the left on the small hill bordering the clearing. Immediately turn right and walk parallel to the clearing for about twenty metres. A cairn marks the entrance to the path. Take this path and then wind your way through a massif of boxwood. You will reach the end of this path.
(9) Descend through this area until you reach the Basse Mihubi sheepfold, which is clearly visible below.
(3) Then take the path on the right to complete the descent and return to the car park at marker 239 (S/E).