(S/E) The first part of the walk follows the classic, well-marked route leading to Puig Carlit. From Lac des Bouillouses, near the Hôtel des Bones Hores, take the path heading due west, which climbs gently to a first fork between Estany Negre and Estany del Viver.
(1) Turn left (a more direct route; it is also possible to turn right) and continue due west. Carry on to Estany Sec, which you go round to the north before heading north-west to Estany de Vallell.
(2) Then head due west up a slope that is relatively gentle at first but becomes increasingly steep until you reach the small pass below Puig Carlit. Don’t hesitate to take a quick detour to the summit – the view is magnificent!
(3) Head due west down the very steep descent (scree), almost to the first small lake known as Estany dels Forats.
(4) Above the pond, leave the path and head due north to go round the rocky hillock to the east of Estany dels Forats. Then head north-east to pass beneath the hillock, where the slope is gentlest. The going is a bit difficult, but once you’ve gone round this hillock, you’ll soon reach a much more pleasant grassy stretch that’s not too steep (I came across some chamois when I did this walk).
(5) Head north-east then north to pass between two rocky massifs (Puig Castel Isard on the left and Ras del Carlit on the right). After this section, continue due north to join the clearly visibleGR® 10.
(6) Once you reach theGR®10, turn right and continue due east to quickly reach Portella de la Grava. TheGR®10descends gently south-east to Lac des Bouillouses.
(7) Keep to the right to walk along the lake heading south, and return to the starting point (S/E).