Park at the Ronatiza-Pineta refuge on the HU-V-6402 road not far from Bielsa.
Signs indicate the start of several hikes and approximate times.
(S/E) Take the roadside path with white and red markings. Follow signs for "Cascade de la Larri".
You'll come to a campsite with a small bar, a ranger's house and picnic tables. There are also large information panels.
(1) Cross this area and follow a well-marked path along the torrent to the left, still heading towards the Larri waterfall. Reach the confluence of the Montaspro and Larri streams.
(2) To the right, begin a fairly steep ascent along the waterfall to reach its summit at the junction with the park's forestry trail.
(3) Turn right and cross a bridge over the waterfall. Continue uphill towards the Larri refuge. Reach the crossroads of a path cutting through the twists and turns of the road.
(4) Turn left and, just before the refuge, reach a sign explaining the various peaks in the area and, above all, how the glacier has been melting over the past century.
(5) Go down the road to return to the previous crossroads.
(4) Take the left-hand path, signposted Refugio de Pineta 2h. Descend into the woods on this steep but passable path.
Note: during winter time, this walk is marked by a large quantity of leaves, which makes some parts slippery, so take care all the same.
Rejoin the road at the Ermita de Nuestra Senora de Pineta.
(6) Turn left onto the road and quickly reach the first crossroads.
(1) Follow the same route as the outward journey, returning to the car park (S/E).