From the top Zerbion peak, due is central position, there is a very wide view on all the most important summits of the Aosta Valley, Gran Paradiso Group, Monte Bianco Group, Cervino, Monte Rosa GroupWe start from Barmasc village, (1.828m). The path is very nice, sometime steep, and crosses, after a wile, a quite wide channel named Ru Cortod;After the small bridge, the path is in a bush of pick pines; the last part of the path, that you simply hike, brings to the Portola Pass, (2.415m). Despite the 600m of level from the beginning, usually you reach the pass in a quite short time, the path from a certain point is very steep. The view on the Ayas valley is magnificent; from the pass you see also the other face of the mountain.Hiking, the view enlarges: you have in front the summits of the central Aosta Valley, and as soon as you arrive on the wide ridge, on your left and behind you, appear the whole Monte Rosa Group and the Cervino; when you arrive to the top, it seems that you can touch these mountains with your hands.Elevation: +1000m - 1000mTime to going up: 3 h.