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Cross Casterino via a small track. You will come across marker 395 (marking the path up to the Fontanalbe valley, which you will take on the way back) and continue a few metres further on to a small car park and marker 394.
(S/E) From there, follow the direction of Valmasque along the stream of the same name. The stone track is very easy to follow and the entire route is generally well marked/signposted. Reach marker 393.
(1) Continue left towards the Valmasque Refuge.
note: the path on the right goes up to Lac de l'Agnel, but the sign has been torn down. See the note in the section "During the hike."
Walk along the Vastière de Valmasque, continue on the track, leaving the bridge below, until you reach marker 374.
(2) Take the path on the left at the marker, still heading towards the refuge. You will cross the Vastière des Dragons, where the Valmasque stream winds its way through the heart of the valley.
(3) You can take a short detour to see a beautiful waterfall. It is visible from the path, so it's hard to miss. A second waterfall is located a little further up as you head back towards the refuge. Reach the trail junction at marker 98.
(4) Turn right towards the Valmasque refuge, which you will quickly reach at the edge of Lac Vert.
(5) Enjoy the view before returning to the previous crossroads.
(4) Turn right, pass marker 97, and continue along Lac Vert.
(6) Continue towards Lac Noir.
(7) Reach the northern tip of Lac du Basto.
(8) Climb the few zigzags to go around the lake to the east until you reach marker 96.
(9) Leave the Vallée des Merveilles path opposite and turn left towards Baisse de Fontanalbe. This is the most difficult part of the entire hike, even though it is not particularly complicated. The path is not very well marked on the ground, but there are numerous yellow and green markings along the route, making it easy to follow. Continue to marker 397.
(10) Enjoy the truly unique landscape here, with countless rocks ranging from blue to purple.
Then follow the direction of Lac Vert de Fontanalbe and continue on to the crossroads at marker 396.
(11) Continue straight ahead on a slight descent to reach marker 386 just above the lake.
(12) Leave the path leading up to Baisse de Valauretta and La Minère on your right and continue towards the Fontanalbe Refuge. You will soon reach the crossroads at marker 387.
(13) Turn left here to reach the banks of the beautiful Lac Vert de Fontanalbe.
(14) Retrace your steps to the previous crossroads.
(13) Turn left onto the path leading to the Fontanalbe Refuge, which you will reach after marker 389.
(15) Continue descending northwards towards Casterino. You will reach marker 390.
(16) Here, turn left towards Casterino and Lac des Grenouilles.
Note: the path on the right also descends to Casterino but arrives downstream from the hamlet at the tree-climbing site.
Continue north then north-east to reach the junction of a circular at marker 392.
(17) Turn left to reach Lac des Grenouilles.
(18) Return to the previous junction by making a circular movement to the left.
(17) Turn left again onto thePR®, continue down a gentle slope, find marker 395 and, a few steps further on, the car park at marker 394, the starting point (S/E).
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tar:
Visorando member
Very difficult 
Moderate 
