The By Basin – Beautiful lake! loop from Vaud

Mountain biking trails

Italy

Aosta Valley

Ollomont

The By Basin – Beautiful lake! loop from Vaud

Hard

4.8

(31)

104

riders

The By Basin – Beautiful lake! loop from Vaud

04:00

30.8km

1,010m

Mountain biking

Hard mountain bike ride. Very good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike.

Last updated: August 27, 2026

Tips

Includes very steep uphill segments

You may need to push your bike.

After 14.8 km for 93 m

After 17.3 km for 97 m

After 24.1 km for 145 m

After 29.8 km for 541 m

Waypoints

Start point

Get Directions

8.02 km

The By Basin

Highlight • Lake

The tiny village of By is nestled in the splendid namesake basin surrounded by imposing peaks of surprising beauty, arranged in a worthy crown: the Grand Combin, Mont Velan, Mont …

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Tip by

8.42 km

Avalanche debris

Highlight (Segment) • Trail

In June I had difficulty bypassing the avalanche debris that was covering the dirt road.

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13.0 km

Beautiful lake!

Highlight • Lake

Great spot to take a break and enjoy the view & reflections. There's picnic benches and possibly even a charging point...

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13.2 km

Ru de By

Highlight (Segment) • River

The Ru de By is a charming stream well known in the area because of the path that runs alongside it. Follow the water, you're sure to be on the right path.

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26.0 km

Thoules Lakes

Highlight • Lake

The des Thoules lakes occupy a shelf at about 2,320 meters in the Comba des Eaux Blanches, the valley that rises from the By basin towards the Fenêtre Durand, the …

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29.4 km

View of Monte Gelé and Glacier from the Plateau

Highlight • Viewpoint

Wonderful plateau with alpine roses, streams and an impressive view of Monte Gele with its glacier and the surrounding three-thousand-meter peaks.

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Tip by

30.8 km

End point

Way Types & Surfaces

Way Types

28.1 km

2.75 km

Surfaces

15.2 km

6.97 km

4.86 km

3.57 km

259 m

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

Weather

Thursday 8 October

8°C

2°C

0 %

Additional weather tips

Max wind speed: 5.0 km/h

to get more detailed weather forecasts along your route

Comments

July 3, 2022,Alpe di By e Fenêtre de Duran

Col di Champillon 2000m if one is lucky enough to arrive at sunset it is a revelation a place of incredible beauty you are completely surrounded by peaks that exceed 3000m up to 4314m of the Gran Combin ice and peaks illuminated by the warm light of the sunset and a large car park where you can park your camper. …

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July 9, 2023,Champillon, Fenêtre de Durand

Not particularly demanding excursion up to the end of the dirt road in Thoules.
Very tiring if, from the end of the dirt road, you decide to go up to Lake Fenetre, as the path, at least uphill, is practically not cycleable with a muscle bike. With ebike it is possible to reduce the push sections by a good 50%. …

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