To get to the starting point, go up the Ubaye Valley towards Saint-Paul-sur-Ubaye. Take the D25, a small road that leads to the Maljasset hikers' car park.
(S/E) Cross Maljasset towards Maurin and its church.
(1) Shortly after the church, take the road on the left towards Combe Brémond.
(2) Drive through the hamlet of Combe Brémond and continue on theGRP® towards Plan de Parouart.
Arrive at the end of the plateau.
(3) Cross the footbridge and keep left on theGR® trail, following the Ravin de la Salcette. You will come to a footbridge over the Ubaye: signposted "Le Longet-Rubren".
(4) Stay on the same bank towards the Cabane de la Blave. Do not follow the path indicated by the sign on the left, which continues parallel on the other bank. Leave the Cabane de la Blave on your right. Shortly afterwards, the river narrows and a bridge becomes visible.
(5) At this bridge, there is a path on each side of the bank. The one on the right bank (there is a low wall nearby) corresponds tothe GR® de Paystrail leading to Lac de Longet. Cross the bridge to join thisGR® trail and follow it to the edge of Lac de Longet.
(6) Leave the marked path and head right towards the lake, going around it on the right.
(7) Crossing the Ubaye river may be difficult at this point. Continue around the lake.
(8) On the eastern shore, small streams and flat rocks allow you to enjoy this peaceful spot. Head towards the Col de Longet by heading north-east. Once at the end of the lake, rejoin theGRP® trail which passes along the northern shore of the upper lakes.
(9) Leave it and turn right to reach the ridge opposite in the direction of Lago Bes: there is no path on this side. Reach the ridge after passing a small lake on the left.
(10) A stream should appear: head towards it. Depending on the time of year (snowmelt, for example), it may be quite deep and wide, and you may have to search a little to find a relatively easy place to cross.
(11) Reach the southern lake and follow its shore on the right to make a short climb to observe rock formations shaped like beams emerging from the water.
(12) Retrace your steps and head for the stone ruin overlooking the lake, starting on the right.
(13) Just behind it, you can climb down the rock face. You will need to wade across the river separating the two lakes to climb north-east towards a second stone ruin.
(14) Continue north-east to reach a third stone hut, which offers a pleasant view of the surrounding area.
(15) Descend towards the second hut and, before reaching it, turn right to reach the shores of the northern lake.
(16) Follow the marked trail to reach the Col de Longet, which allows you to cross the ridge.
(17) Begin the descent towards Lac de Longet.
(6) Take the same route back up to return to the car park (S/E).