Free parking at Lac de Cap de Long.
(S/E) Take the path, which is rough in places due to scree, and follow the lake before climbing in switchbacks to pass several rocky outcrops. You will then encounter a series of short, successive ascents and descents. Finally, leave the lake and enter the valley to gradually reach the stream.
(1) Cross the Cap de Long stream at this point, or a little further on. In either case, go round to the right for a steep climb.
(2) Follow the cairns and make your way over granite terrain, sometimes needing to use your hands. You will eventually reach a small lake.
(3) Go round it to the left, cross the Ruisseau de Cap de Long again and continue following the cairns, which are clearly visible. Then climb up over schist terrain that is fairly well marked at the start, then vaguely indicated by the cairns. Head for a large pass to the right of the summit of Campbieil, which is now magnificent and clearly visible. Reach the pass, covered in white rock smoothed by ancient glaciers, contrasting beautifully with the surrounding dark schist.
(4) Turn left towards the pass between Campbieil and Lentilla, which is easily visible. You will soon reach a fork. Continue along the path, which climbs steeply, veering slightly left over stony ground.
You will finally reach the pass between the two peaks. There is a sweeping view over the Piau Engaly valley.
(5) Continue left along the ridge, which leads easily to the Pic de Campbieil (3,173 m), marked by a large cairn.
Return to the pass.
(5) Continue straight ahead along the ridge, which leads very easily to the second 3,000-metre peak of the day, Pic de Lentilla (3,157 m), marked by a cairn.
(6) Return quickly to the pass.
(5) Continue straight ahead to reach the summit of Pic de Lentilla.
(7) Return to the pass.
(5) Head left along the same path and return to the car park at Lac de Cap de Long (S/E).