From the square in Viganella, follow the “Strada Antronesca” road until the turnoff for Albarina, then descend to cross the Ovesca stream and climb along trail C09, which leads to Alpe la Piana and which, after a long climb, comes to the ridge of Colma with its mountain pastures of Erbalunga, and Colma dei Prei. From Colma’s mountain hut, a stop on the Via Alpina and the Grand Italian Trail (SI), head downhill into the dense woods before Alpe Prei and then Alpe Lamporiggia. Continuing down the increasingly steep slope, you will eventually reach the valley floor and the local road of the hamlet of Mundà and, through the new route in the wildlife oasis, you will reach Agriturismo di Alberobello. Continue onwards to Rivera along the paved road and, taking the “Strada Antronesca”, return to Viganella.

Notes: This excursion is entirely immersed in dense woods on the shadier side of the Antrona Valley, in places that were witnesses to clashes, counter-attacks and raids during World War II and the Italian partisan uprising. The crest of Alpe della Colmine stands out for its spectacular airiness: from here you can take in a view that spans from the lake to the high mountains of Sempione. The Rifugio della Colma mountain hut is open in summer (Tel. +39 347 9020098).