5.0
(5)
62
riders
5
rides
Gravel biking around Bionaz, nestled in the Valpelline valley of the Aosta Valley, offers diverse terrain for outdoor enthusiasts. The region features unspoiled nature with towering mountains, verdant basins, and lush forests. Riders can explore a mix of white roads, forest roads, and paths along ancient irrigation canals, providing varied gradients and surfaces. Prominent features include the scenic Place Moulin hydroelectric reservoir and numerous alpine lakes.
Last updated: June 30, 2026
38.8km
05:03
1,550m
1,020m
Hard gravel ride. Very good fitness required. You may need to push your bike for some segments of this route.
5.0
(3)
29
riders
26.8km
02:17
730m
730m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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3
riders
18.9km
02:30
1,020m
1,020m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
15
riders
28.8km
02:15
670m
670m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
5.0
(1)
5
riders
13.4km
01:19
240m
240m
Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
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High mountain lake with a dam for electricity production. Beautiful is the view of the Matterhorn, not far away
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The Lo Ditor pond is located at an altitude of 1,900 meters. It is a flat wetland area formed by the Petit Monde stream and surrounded by larch woods. The area is classified as a Special Conservation Area due to the rarity of its habitats, including limestone springs that promote the growth of rare plants. Furthermore, this ecosystem ensures the ideal microclimate for the common frog, which chooses these shallow waters for egg-laying during the thaw.
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Il Prarayer is an alpine plateau located at about 2000 meters above sea level, at the end of the Place-Moulin lake. It is reached by a simple path that runs along the lake, almost always flat. The environment is open, with meadows, small streams, and some alpine pasture buildings. The landscape is surrounded by high peaks and glacial environments, clearly visible in the background. The Rifugio Prarayer is located here, used as a base for longer excursions. The area is suitable for a quiet break after the walk along the lake. Itineraries to side valleys and high-altitude routes start from here. Despite the altitude, the setting remains accessible and not very demanding.
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The Place Moulin dam is a majestic arch-gravity dam, designed to make the most of the narrow and incised conformation of the valley. Its concrete structure develops with a slight curvature, which allows the water's thrust to be transferred to the lateral rock walls, reducing direct pressure on the base and ensuring high stability. With a height of approximately 155 meters and a crest length of over 600 meters, it represents one of the most imposing hydraulic works in the Italian Alps. The artificial basin formed upstream reaches a capacity of over 100 million cubic meters of water, mainly fed by the Buthier stream and glacial meltwater. The plant is an integral part of a hydroelectric system: the accumulated water is conveyed through penstocks to power plants located downstream, where the head is transformed into energy. The management of levels is regulated by surface and bottom outlets, designed to control both floods and ordinary releases.
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The Marmitta dei Giganti in Bionaz is a striking cavity carved into the rock that tells of the power of the alpine glaciers. It formed during the last ice age, when meltwaters, laden with sand and stones, channeled into powerful vortices: the debris, rotating ceaselessly, smoothed the rock to create this deep, almost perfectly shaped "pot". Alongside the scientific explanation, the charm of legend also survives: it is said that giants dug these cavities, using them as containers or leaving their superhuman strength imprinted on them. It is precisely this intertwining of nature and imagination that makes the place so fascinating.
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The Gorza mountain pasture and lake are an ideal destination for those seeking a scenic walk immersed in nature. The mountain pasture offers vast pastures and splendid views of the surrounding mountains, while the nearby alpine lake offers a quiet haven perfect for a relaxing break.
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ski area, even in summer it's a postcard
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Beautiful. You can't reach the chapel by bike. You have to leave it on the path and walk there, as it's in a private area with no access allowed.
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Bionaz offers a selection of 5 dedicated no-traffic gravel bike trails, ranging from moderate to difficult. These routes are designed to provide an immersive experience away from vehicular traffic, allowing you to fully enjoy the stunning Alpine scenery.
The trails in Bionaz feature diverse terrain, perfect for gravel biking. You'll encounter a mix of white roads, forest roads, and paths along ancient irrigation canals known as 'ru'. These surfaces provide varied gradients and an engaging ride through verdant basins, lush forests, and alongside alpine lakes.
While many routes in Bionaz are rated as difficult, the region does offer paths suitable for a more relaxed pace. For instance, the largely flat paths along the Place Moulin Dam – Prarayer Hut loop from Oyace offer scenic views of the emerald green lake and are more accessible for various levels, though the full loop is still considered difficult. The Lexert picnic area also has tranquil trails leading into forests.
Bionaz's trails are rich with natural beauty and cultural sights. You can cycle past the impressive Place Moulin hydroelectric reservoir, one of Europe's largest dams, or explore the extensive Montagnayes nature reserve. Traditional villages with ancient wooden 'rascards' and chapels offer a glimpse into local history. Notable highlights include the Blue Lake and various mountain passes like Cignana Window, offering breathtaking viewpoints.
The best time for gravel biking in Bionaz is typically from late spring through early autumn (May to October). During these months, the weather is generally milder, and the trails are free from snow, allowing full access to the high-altitude routes and enjoying the lush landscapes.
Yes, Bionaz features several circular routes that allow you to start and end in the same location. An example is the Place Moulin Dam – Prarayer Hut loop from Oyace, which offers a complete circuit through the stunning Valpelline valley.
Parking is generally available near the starting points of many routes, particularly in and around the main villages and popular attractions like the Place Moulin Dam. Specific parking information can often be found in the detailed route descriptions on komoot.
The area is highly rated by the komoot community, with an average score of 5.0 stars. Reviewers often praise the unparalleled tranquility, the stunning views of towering mountains and pristine lakes, and the immersive experience of cycling through unspoiled nature away from traffic.
Yes, Bionaz is dotted with mountain huts and refuges that serve as excellent rest points or overnight stays. Notable options include Rifugio Prarayer, Rifugio Nacamuli at Col Collon, and Aosta Refuge. These provide a chance to refuel and experience traditional alpine hospitality.
While Bionaz is a more remote Alpine destination, some public transport options, primarily bus services, connect the valley to larger towns in the Aosta Valley. However, direct access to specific trailheads might require additional planning or a short ride from the nearest bus stop. It's advisable to check local bus schedules in advance.
The entire Valpelline valley, where Bionaz is located, is known for its tranquil and less-trafficked nature compared to more popular Alpine destinations. Exploring routes through the extensive Montagnayes nature reserve or the numerous forest roads often leads to serene experiences away from crowds, offering a true sense of wilderness.


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