The starting car park is located at the entrance to the village of Chapias, on the left as you go uphill.
(S/E) From the car park, head up the road to the left and cross through Chapias. Turn right at the first junction, pass by the Chapias Tower, and leave a road on your left. Leave the road and take a path to the right alongside a vineyard. After 300 m, you will see the Unal house on your left.
(1) After the house, take a path on the left, which can be identified by traces of old white-and-yellow markings. A little further on, just before a section over rocks, turn right. Pass by the Valla pond and take the road on the right.
At the three-way junction, turn right. In the next section, the IGN map is out of date; rather than a path, you are actually on a dirt track whose continuation is not shown. (See instead the satellite photo or the OpenStreetMap).
(2) When this track turns left, continue straight on along a path. Do not take the parallel track, which ends in a dead end at a viewpoint. You can make a round trip to this viewpoint and then return to the path, which descends very steeply to the tarmac road. Take the road on the right and follow it to a left-hand bend in front of a small hut.
(3) Go round the hut and take a white-and-yellow signposted route to the right. Cross the stream via the footbridge, slightly downstream from the route shown on the map. Continue climbing the path until you reach the stream again.
(4) If there isn’t too much water, cross over and continue straight on along the marked path , ignoring the GPS route shown here, which you’ll rejoin a little further on.
However, when there is a lot of water, the waterfall downstream is magnificent but the crossing can be very difficult. In this case, go back a little way, climb the rocks and head up the left bank through the undergrowth. Go round the confluence of the two streams and rejoin the path a little further up. The water actually emerges from a resurgence located right at this confluence. Upstream, there is no water at all.
Further along the path, before reaching the top, you’ll notice a cave on the left bank of the ravine. You’ll arrive at a viewpoint on the edge of the plateau.
(5) Take the path on the right. Leave the road leading to La Mare aux Anges on your right.
(6) At the junction with the D315, turn right to reach the car park (S/E).