If you start the trek in Catalonia, the easiest way is to start at camping Bordes de Graus (the camping is accessible by car).

If you want to start from the refuge Certascan there is a 3 hours walk extra to arrive at the refuge following the trail "Llurri".

If you start the trek in France, you can go to gîte du Presbytère in Aulus les Bains or to gîte l'Escolan in Bidous (Ustou). Both gîtes are accessible by car.

1st Stage:
Start: Camping Bordes de Graus, 1360 m.
Arrival: Refuge
Certascan, 2240 m.
Unevenness: +1570 m., -670 m.
Distance: 12,5 km.
Time: 6.20 hours

2 st Stage:
Start: Refuge Certascan, 2240 m.
Arriv
al: Gîte Presbytère in Aulus les Bains, 760 m
Unevenness: + 550 m., - 2020 m.
Distance: 16'9 km.
Time: 9,00 hours

1st Stage:
Start: Gîte Presbytère in Aulus les Bains, 760m
Arrival: Gîte l'Escolan in bidous (Ustou), 760m
Unevenness: + 950 m., -940 m.
Distance: 16'6 km.
Time: 5.30 hours

4st Stage:
Start: Gîte l'Escolan in bidous (Ustou), 760m
Arrival: Camping Bordes de Graus 1360 m
Unevenness: + 1620 m., - 1025 m.
Distance: 17,3 km.
Time: 7.20 hours