We leave Limonetto and immediately take the GTA path, which gently climbs (approx. 600 m height difference) the Vallone San Lorenzo, surrounded by pastures, up to Colle di Tenda (1,871 m). From there, we continue on the roadway (known as Salt Road), arriving shortly after at the two great military forts (Forte Alto and Forte Centrale), unfortunately, abandoned. We are on the Italian-French border, which from here on we will follow for a long time.

We continue on the roadway until we reach the start of the path that climbs (approximately 200 m height difference) towards Bec Roux (2,214 m). We approach the stretch with caution, the slope is really high and some sections are slightly exposed. Once at the top we enjoy the incredible view, which embraces most of the western Alps. We resume the march on a well-trodden track, with gentle ups and downs, following the ridge overview and passing several minor peaks in rapid succession, until we reach the Colle della Boaria (2,102 m). We continue on the cross path, under the vertical wall of Testa Ciaudon (2,386 m). With a short climb, we reach the Colla Piana di Malaberga pass (2,219 m), from where we can admire the rocky mass of Cima della Fascia (2,495 m).

Detaching ourselves from the borderline, we begin the descent (approximately 350 m drop) entering a valley with a new, karst appearance (as suggested by its name: Conca delle Carsene). Once on the beautiful plateau of Gias dell' Ortica (1,860 m), we continue eastward, returning to climb (approximately 100 m height difference) easily up to the Passo del Duca, located under the Testa del Duca, a rocky spur.

We cross the hill and enter the amphitheater of the Marguareis massif. We quickly lose altitude, then ascend again (approximately 250 m height difference) the Vallone del Marguareis: with the last stretch, we are at the Laghetto del Marguereis. The last stretch in a pleasant cross path takes us to the fantastic Rifugio Garelli.