Depart from the Granges car park, just before the hamlet of Fouillouse.
(S/E) Take the marked trail GR5-PR towards the east, climbing gently. Go alongside the cemetery on your left and, a bit higher up, the Chapel of Pierre Abbey. At the chapel, continue straight on until you reach the first path on your left, the PR of the Refuge de Chambeyron.
(1) Stick to the left on the path which, at the beginning, goes alongside a dead-end street for vehicles on the left-hand side. Heading north initially and then north-west, climb the side of the ridge. The path leads to a crossroads.
(2) Turn to the right and stay on the marked trail, ignoring the other tracks on either side. The hike gets a bit harder here with a steep climb, arriving at last at a ledge on the side of the rocks. Continue east-south-east, then pass through the blocks of stone. You will reach a small pass and descend to the Refuge du Chambeyron.
(3) Leave towards the north by going around the left-hand side of the refuge, in the direction of the Lac des Neuf Couleurs. At a fork in the path (ref 2628), veer towards the right.
(4) Pass the Lac Long on the left and proceed further to the east. Be careful to stay on the path as it can be easily lost especially when it's been snowing.
(5) At the Lac des Neuf Couleurs, climb to the right in zigzags (sign for the Col de la Gypière - the Gypière Pass), with a view of the Brec de Chambeyron on your right.
(6) At the pass, go back down the other side of the slope until you reach the next branching off before the Bivouac Barenghi.
(7) Turn to your right and continue towards the south.
(8) Branch off to the right (south-west).
(9) Cross the border again through the Stroppia Pass. Descend (west) on the PR up to the next crossroads.
(10) Take the right and follow it up to the next branching off where the PR for the short tour of Chambeyron begins on the right.
((11) Leave the PR and continue straight on (north-east).
(12) Lower down, at the site of the Plate Lombarde fort, you will re-join the GR5 again. Branch off to the right on to this route and head downwards to the bridge which crosses the Riou de Fouillouse (small stream). Leave the bridge to the left-hand side and re-join point (1).
Continue straight ahead in order to return to the car park you started from (S/E).
