📌 (0h0min; 0 kms) Sallent de Gallego (1288m). Leave the village along a track that initially runs parallel to the river. After a few minutes, take a crossroads on the left, the track becomes a path and after a stretch of ascent it joins the road that goes up to the Sarra reservoir. Continue along it until you reach the dam. Just before it, there is a path on the left that soon becomes a path that skirts the reservoir in about 15 minutes.

📌 (0h55min; 3,6 kms) Tail of the Sarra reservoir (1420m). Entrance to the Ordesa-Viñamala biosphere reserve. On the other bank there is a small car park and a bar-restaurant. We leave behind us, without crossing, the Faxas Bridge and shortly afterwards a recreational esplanade (Plana Tornadizas). The path enters the forest and goes up the Aguas Limpias valley on the right bank. It crosses several ravines, Bozitero, del Ministirio, de Balsaroleta and del Garmo Negro before reaching Paso del Onso, a narrow area with large cliffs. We then pass Llano Cheto, where the waters of the Arriel ravine join in.

📌 (2h00min; 7,6 kms) Crossing to the ibones de Arriel (1735m). We continue up the valley parallel to the river, the path becomes harder, the valley opens up and we finally see the dam of the Respomuso reservoir. The path passes by the Virgen de las Nievas hermitage (next to the dam) and continues along the right bank of the reservoir.

📌 (3h15min; 11,2 kms) Refugio de Respomuso (2200m).