Free access · Year-round
Cascade de la Diomaz above Lac de Vallon, Bellevaux, Haute-Savoie

Cascade de la Diomaz

Several waterfalls carving natural rock pools, reached in 30 minutes on foot from Lac de Vallon. At the foot, the Carthusians' cross engraved in the stone.

TypeNatural waterfall
AccessFree · Open
CommuneBellevaux
Duration30 min on foot from the car park
ParkingFree (Lac de Vallon car parks)
DogsAllowed on leash
StrollerNot suitable
Best seasonApril – October

About Cascade de la Diomaz

The Cascade de la Diomaz is a natural waterfall in the Chablais, at around 1,223 m altitude, on the boundary of Bellevaux and Mégevette. It forms on the Diomaz stream, a tributary of the Brevon, which flows down into Lac de Vallon. Access is free year-round.

The waterfall is made up of several cascades flowing into rock pools naturally carved into the stone, known as the Carthusians' pools (marmites des Chartreux). At the foot of the waterfall, a cross known as the Carthusians' cross is engraved in a rock: it marked the boundary of the territory of the Carthusian monks who occupied the site for nearly four centuries, around the Sainte-Marie de Vallon monastery whose ruins and the Chapelle Saint-Bruno remain.

What you can do there

Practical info

How to get there

When to visit

Where to eat, drink, stay nearby

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Frequently asked questions

Is access to the Cascade de la Diomaz paid?
No. Access to the Cascade de la Diomaz is free and open year-round.
How do you get to the Cascade de la Diomaz?
The Cascade de la Diomaz is reached in about 30 minutes on foot from the Lac de Vallon car park in Bellevaux, via the Chapelle Saint-Bruno.
Can I bring my dog to the Cascade de la Diomaz?
Yes. Dogs are allowed on the trail to the Cascade de la Diomaz, on leash.
Is there parking to reach the Cascade de la Diomaz?
Yes, two free car parks by Lac de Vallon serve as the starting point for the Cascade de la Diomaz.
Is the Cascade de la Diomaz suitable for strollers?
No. The trail to the Cascade de la Diomaz is a forest path with stream crossings and sections secured with handrails, not suitable for strollers or wheelchairs.
What is the Carthusians' cross at the Cascade de la Diomaz?
At the foot of the Cascade de la Diomaz, a cross is engraved in a stone: it marked the boundary of the territory of the Carthusian monks who occupied the site around the Sainte-Marie de Vallon monastery for nearly four centuries.
Is the Cascade de la Diomaz in the commune of Bellevaux or Mégevette?
The Cascade de la Diomaz sits on the boundary between Bellevaux and Mégevette. The marked tourist access starts from Bellevaux (Lac de Vallon), and the official listing is managed by the Office de Tourisme des Alpes du Léman.
Can you swim in the pools of the Cascade de la Diomaz?
No official information confirms authorised or equipped bathing at the Cascade de la Diomaz. The site is a sensitive natural environment, the pools are deep and the flow variable.
Sources

Cross-checked across multiple sources at publication date. Information may change — confirm with the official operator before a specific visit.

Published 24 avril 2026 · Last updated 24 avril 2026 · Report outdated info