Starting from the parking lot (1,368 m), continue on the gravel road winding into the Valasco valley, with Rocca Sottana of San Giovanni (2,325 m) on your left, and on your right you can see the rough gorges descending from the central peak of Mount Matto (3,097 m).
After walking a hair less than one kilometer, nearby an electric plant made of stone, leave the main road (with its lazy hairpins) and turn left on a few shortcuts that basically follow the river bed. Follow these shortcuts until reaching the lower edge of Valasco in the vicinity of the fork to Valmiana hill (fountain).
Now walk through the valley of Valasco (1,735 m) following the trail that climbs to the right side of Reale Casa di Caccia, now converted to a comfortably equipped mountain hut.
Get to the waterfall and the bridge over the stream at the end of the flatland.
After a few dozen meters, leave to your left the path that gets to the Morta valley and the Valasco hill (signpost), and turn right crossing, after a short walk, a second wooden bridge. The trail continues ascending with hairpins into the larch wood, rewarding you with wonderful panoramic views of the Valasco flatland.
At about 2,000 m, near a huge larch (signpost to the Questa mountain refuge), turn left leaving behind you the trail that goes towards Valscura (your return route).
The trail proceeds with a diagonal winding pattern, moving away from the rocky cliffs. At this point you can enjoy more panoramic views of the Morta valley and of the rugged and wild Prefouns gorge. After a few hundred meters the path crosses the military road coming from the Morta valley.
Proceeding on the opposite side, with a few zig-zags you reach the Questa refuge (2,388 m, fountain), nestled in a lovely place under the cliffs of Testa de Claus (2,889 m), of Portette (2,821 m) and of Margiola (2,831 m). The refuge is open from 6/15 to 9/15, but it can also be reserved, on demand, during other months. It has 17 beds and offers traditional Piedmontese cuisine. From the flat of the refuge you can see, just above, the truly amazing glacial lake of Portette (2,361 m), with an intense blue color, amongst the deepest of the Maritime Alps.
From the Questa refuge, go back until you reach the gravel road. Turning left you detour towards the Valscura lakes and in about twenty minutes you reach the edge of the lake of the Claus (2,344 m) and other magnificent water pools.
Beyond the lakes the mule track descends into a hollow, which is really extraordinary thanks to the perfection of the ex-military road that, even after over a hundred years, is still perfectly preserved.
A last climb, followed by a descent, leads to the Valscura valley and then to the large lake inferior (2,274 m).
From here you start your descent on the trail that goes back to Valasco. You can avoid a tunnel if you follow, shortly after, a shortcut on the right. Once you get back to the huge larch you have concluded this wonderful circular route. Now just follow the trail all the way back to get to your parking lot.