Take the D918, cross the village of Barèges (65) and climb towards Tourmalet. Shortly before the Tournaboup ski resort, turn right onto the small, well-signposted hairpin mountain road. The start is at a place called Le Lienz, where there is a huge car park in front of the "Chez Louisette" inn, which can be used in both summer and winter, at an altitude of 1504 metres.
NB: if you are lucky and the cattle grid leading up to Camp Rollot is open, you can drive up there. There is parking for around 50 vehicles at Camp Rollot, at an altitude of 1,557 metres.
(S/E) Head east on the access road to the car park. After about 150 m, turn right in the middle of the trees onto a path that climbs south-south-east through the mountain pastures. You will reach the buildings (and tents in summer) of Camp Rollot.
(1) Then take the wide track that continues south-south-east and then south. Follow the Ruisseau de la Glère stream on your left. The path continues like this for about 3 km.
(2) Cross a track twice and continue climbing along the path. Join the track and follow it to the left for about 100 metres. Then take the path on the right and cross the track again. On the other side, turn right onto the path (do not cross the Ruisseau de la Glère). Shortly afterwards, turn left and climb, leaving the EDF facilities on your left. This will take you to the northern tip (downstream) of Lac de la Glère.
(3) Turn right and climb quickly to the Refuge de la Glère.
(4) Cross the terrace of the refuge and take the well-marked trail south towards Turon de Néouvielle and Lac det Mail. From there, you will find regular but widely spaced yellow markings, as well as numerous cairns.
(5) At a fork, leave the main marked trail, go left and head towards the western tip of Lac de Coume Escure. Turn right to rejoin the main trail.
(6) Continue climbing south-southeast, then southeast.
(7) Cross a stream on a narrow footbridge (deck missing). Shortly after, you will reach a trail junction.
(8) Continue straight ahead (south-east, leaving the path leading to the Refuge Packe on your right). Enter the heart of the Pyrenees National Park, pass between two small lakes and reach the magnificent Lac det Mail.
(9) Follow the lake on your right on the trail, which remains clearly visible and well marked. The terrain is granitic and lunar, with rocks polished by the ancient glacier and scattered boulders. Water is everywhere, between streams, puddles, lakes and small lakes. The slope becomes steeper. Even in the middle of summer, it is not uncommon to find the first snowfields here at around 2,600 m, but there is no need to cross them. You will arrive at the northern tip of the first and largest of the Lacs Verts (Green Lakes).
(10) Continue south and pass a large ledge towards the Lacs de Maniportet, which are still invisible. Reach the eastern shore of the Lac Bleu de Maniportet.
(11) Continue south between this large lake and its smaller counterpart on the left, Lac Cœur Bleu. Climb up through scree, keeping Lac Glacé de Maniportet on your right. Reach the bottom of the small Cirque de Maniportet, where you can still see a large snowfield. The trail follows the ridge separating the Lac Glacé and the snowfield of the Glacier de Maniportet. In summer, you can avoid the last snowfields by going around them. This will take you to a ridge just below the summit.
(12) Follow the ridge to the right and quickly reach the Turon de Néouvielle, where two large cairns stand (bivouac possible). From here, the 360° view is breathtaking (see § Nearby).
(13) Descend the ridge you came up (north-northeast).
(12) Leave the path you came up on to your left and continue along the ridge (north-east). Follow the ridge line to reach the summit of the Premier Conseiller (marked on the OSM map).
(14) Continue north-east along the ridge and pass the Second Conseiller (not marked on the maps).Progress is slow over the piled-up rocks and 45° sloping slabs. Make grade 2 climbing steps. Reach a large ledge (5 to 8 m). To avoid grade 3 climbing steps, leave the ridge line and descend as soon as you can see a cairned ledge a few dozen metres below the ridge line on the south-east slope. Once you reach it, this ledge is roughly on the contour line. Follow it as far as possible. When it comes to an impassable rock face, take a near-vertical chimney on the left that climbs back up to the ridge line. This ledge passage takes about 20 minutes. This brings you to the summit of the Pic des Trois Conseillers, marked by a large cairn.
(15) Head northeast, descending through boulders and scree towards the nearby Brèche de Néouvielle, about a hundred metres below.
(16) Turn left and take this narrow, letterbox-like breach. Descend the scree towards Lac Cœur Bleu (north-west).
(17) Leave the lake on your right and continue off-trail towards the north. Follow Lac Vert Allongé on your right and rejoin the junction you took on the way up.
(10) Continue north and descend via the same route as on the way up.
(6) Keep left on the marked trail (do not make the detour to Lac de Coume Escure).
(5) Follow the path downhill in the opposite direction to the way you came until you reach the Lienz car park (S/E).