Ferrata dei Gemelli

Overview

The Ferrata dei Gemelli is a challenging loop route that traces the border between the Aosta Valley and Piedmont, in the Gressoney Valley sector. This demanding itinerary visits the three peaks known as the Gemelli in succession before reaching the Colle di Mologna Grande, with an optional side trip to the nearby Punta Tre Vescovi. The route is highly exposed, running for long stretches along sharp ridges with dizzying drops on both sides, making it suitable only for experienced, fit hikers who are completely comfortable on exposed terrain.

The route is characterized by continuous, sustained progression along a granite ridge typical of the Monte Rosa massif. The line is predominantly horizontal but articulated, with repeated ups and downs that challenge the hiker both physically and technically. Exposure is constant and pronounced, making the route exceptionally scenic but also psychologically demanding. The narrow, jagged ridge morphology defines a high-mountain experience where the severe environment and isolation contribute to its wild character.

Approach

The starting point is the hamlet of Niel, in the Aosta Valley municipality of Gaby. To reach it, drive up the lower Gressoney Valley to the town of Gaby; near the town hall, take the road that climbs toward the Niel Valley. After crossing the bridge over the stream, follow several switchbacks until you find a large open area to park. From here, hike up past the last houses of the village, where signs for local trails are posted. Follow trail 6C (yellow-black markers) toward the Colle della Piccola Mologna. The path, initially a wide mule track through the woods, crosses an ancient stone bridge and continues through meadows to a scree field. Here, you ascend along the remains of a historic mule track dating back two centuries, which once connected the Aosta Valley with the Biella Valley. This brings you to the Colle della Piccola Mologna (2205 m), where the approach ends and the via ferrata begins, after about 2 hours of hiking from the parking area.

The approach takes place in a mid-mountain environment, with steady but not excessive elevation gain, gradually preparing you for the challenge ahead. The transition from forest to alpine meadows and finally to scree marks a clear morphological shift, introducing the severe landscape of the sector. The pace of the approach is regular and allows for proper acclimatization, while the historic mule track adds an element of historical-alpine interest to the route.

Via Ferrata

From the col, the Ferrata dei Gemelli begins by climbing northward up the rocky outcrops of the fore-summit, following cairns and sparse markings. This initial section, quite strenuous, overcomes two rocky humps before reaching the summit of the first Gemello (2473 m). From here begins the thrilling ridge traverse, which unfolds with continuous ups and downs, often aided by fixed ropes and chains. The highly exposed route allows you to conquer the other two Gemelli in succession, also known as Mologna Piccola (2435 m) and Mologna Grande (2398 m). After traversing the entire sharp ridge, you finally descend to the Colle di Mologna Grande (2364 m), where the actual equipped section ends. This ridge traverse takes about 2 hours from the starting col, for a total of 4 hours from the Niel parking area. Once at the col, you have three options: begin the descent trail directly; take about 50 minutes (round trip without stops) for the side trip to the summit of Punta Tre Vescovi (2503 m), reached via a steep trail; or descend about 200 meters on the Biella side to reach the Rifugio Rivetti (2194 m).

The technical progression focuses on overcoming a sharp ridge, where the equipment (ropes and chains) assists the most exposed passages but does not eliminate the need for good climbing technique on solid, compact rock. The pace is discontinuous, punctuated by repeated gains and losses of elevation between one summit and the next, in a succession of short technical ascents and descents. The environment is completely open and dominated by views of sheer slopes, with a feeling of great exposure that persists throughout the traverse. The route's character is therefore predominantly technical and scenic, with physical effort stemming more from the continuity of exertion and required concentration than from the extreme difficulty of individual passages.

Descent

The descent to Niel starts from the Colle di Mologna Grande. Take trail 6B, which initially branches off to the left from the ridge to enter the alpine meadows. The path passes by several small lakes and descends progressively through alpine pastures, eventually following a comfortable mule track that leads back to the hamlet of Niel and the parking area. This return section takes about 2 hours and 30 minutes from the col. The total time for the loop, excluding the climb to Punta Tre Vescovi, is therefore about 6 hours and 30 minutes. If you include the side trip to the summit, the total time rises to about 7 hours and 30 minutes.

The return offers a stark contrast to the previous section, immersing you in a gentler, pastoral environment. The descent is long but steady, on grassy terrain and later a mule track, allowing for a gradual cool-down. The route passes by small bodies of water and ancient alpine pastures, concluding the experience in a more tranquil atmosphere after the intensity of the ridge. The pace becomes markedly more relaxed and continuous, with no significant technical obstacles.

Useful Notes

This long and interesting itinerary is characterized by continuous progression along a ridge. The equipped sections, while not of extreme difficulty, feature very airy ups and downs that should not be underestimated, especially on wet or damp rock given the exposure of the steep slopes. The environment is wild and relatively uncrowded. It is also possible to tackle the route from the Biella side, starting from the town of Piedicavallo and following trails E60/E69. Given the length and commitment of the excursion, it is difficult to combine it with other itineraries on the same day; however, in the Gressoney Valley area, you can find other equipped routes of similar challenge, such as the Sentiero Attrezzato al Rifugio Quintino Sella, the Sentiero Attrezzato del Vofrede, the Sentiero Attrezzato Panorama above Aosta, or the Ferrata José Angster at Gressoney-Saint-Jean.

The itinerary requires good physical fitness to sustain the long duration and continuous concentration demanded by the exposure. Its technical nature is more about managing balance and psychology in exposed terrain than pure strength, making it a classic alpine route. Choosing the right period and weather conditions is crucial, as the completely exposed ridge can become challenging or dangerous in wind, rain, or residual ice.