From Gap, take the D994 (Veynes road) then the D503 towards the village of Rabou. Shortly before the village of Rabou and just after crossing the Torrent de la Rivière, take a small road on the right towards the hamlet of La Rivière and continue to the end. There are a few parking spaces along the road.
(S/E) Do not cross the stone bridge. From La Rivière, take the path on the left that climbs towards Les Tournillons, heading north, until you reach the next crossroads 50 metres further on.
(1) Continue on the path on the right that runs alongside the stream. Cross the stream for the first time and climb up the other bank.
(2) Continue along the well-marked path on the left, still following the stream bed. The mountainside may have streams running down it during the snowmelt period. Cross the Torrent de la Rivière a second time, then a third time, alternating between open sections and sections under the trees.
(3) Continue along the path opposite, ignoring the one that climbs to the right. Cross the stream one last time to climb up to the hamlet of Les Tournillons just above.
(4) Take a well-deserved break at the ruins. This is the ideal spot for a picnic in the meadow or under the trees. Although the return journey is easier on the left bank, retracing your steps along the same route, this trail continues the circular path on the right bank along a balcony path with a few passages through ravines, one of which is slightly tricky.
To do this, pass by the foot of the ruins and head west into the trees.
Cross a first valley. You will soon reach a passage on the side of the marl, which can be slippery. This is the only real difficulty on the route.
Continue along the hillside on the single path that crosses pastures before becoming more rocky, then rejoins the trail.
(1) Continue straight ahead to quickly return to the car park (S/E).