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(S/E) Departure from the Lac des Bouillouses car park.
(1) Cross the lake dam, leave theGR®10 trailon your right along the lake shore and follow the main trail marked "boucle des 12 lacs" (12 lakes loop).
You will walk for a few hundred metres through a semi-open area among pine trees until you reach a crossroads near two small lakes (Estany Negre on your left and Estany del Viver, which you can see on your right).
(2) Take the path on the left for a clockwise loop (you will return via the path on the right).
About 500 metres further on, you will find two more lakes (Estany Sec on your left and Estany de la Comassa on your right). There is also a shelter near these two lakes.
Continue along the trail for several hundred metres until you reach a crossroads, near another small lake (Estany de Vallell).
The path on the right will take you back to your starting point via the short route of the Carlit lake loop.
(3) Continue straight ahead.
You are now at an altitude of over 2,200 metres and the pine trees have disappeared.
Continue through this open area with views of more lakes for about 1 km until you reach the next crossroads.
(4) Once again, leave the trail on your right ("12 lakes loop" or Carlit lakes), which will be your return route. Continue climbing.
(5) This is the last lake before the actual ascent of Puig Carlit, which is a round trip. All you have to do is follow the single, steep path.
In the last few metres, follow the vague red dots on the rocks (where the tracks are most pronounced).
In some places, you may need to use your hands, but nothing too difficult.
Be careful not to slip, as you may not be alone.
(6) When you reach the top of what looks like a small pass, you have 30 metres to go on your left, and you are at the summit of Puig Carlit, the highest point in the Eastern Pyrenees at 2,921 metres.
Descend via the same route.
(4) On your return, rejoin the 12 lakes loop at the last crossroads you passed (this time it will be on your left!), which will take you back to your starting point, passing by lakes that you had only admired from afar (Estany de Sobirans, Trebens with a shelter, Castellà and Les Dugues).
(2) After passing through the pine trees again, you will find the path you took at the start. Follow it downhill until you reach the Lac des Bouillouses and the car park where you started (S/E).
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