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The Chaîne des Puys and the Limagne Fault, a UNESCO World Heritage Site

Published 31 October 2026

Since 2 July 2018, the "Chaîne des Puys – Limagne Fault tectonic arena" has been on the UNESCO World Heritage List. It was the first natural site in mainland France to be listed. From Clermont-Ferrand, it is literally in front of you: just look west to see the puy de Dôme and the line of volcanoes.

What UNESCO recognised

The site was not listed for its beauty, even if that counts, but for what it tells us about the Earth. It illustrates the "tearing apart" of a continent, a process known as rifting, which is rarely seen so clearly. It is listed under criterion (viii), which concerns major stages of geological history, and covers 24,223 hectares.

Three elements make up the whole:

• The Limagne Fault: the great escarpment separating the plateau des Dômes from the plain where Clermont lies.
• The Chaîne des Puys: around 80 volcanoes lined up over some thirty kilometres. Each one was born from a single eruption.
• The montagne de la Serre: an ancient lava flow that has become a ridge, because the rock resisted erosion better than the surrounding land. Geologists call this inverted relief.

A story in three stages

Around 35 million years ago, the Earth's crust stretched. The Limagne plain subsided and filled with water, before this lake dried up. Around 3 million years ago, the plateau rose and the fault was exposed, while a lava flow gave birth to the future montagne de la Serre.

The volcanoes of the chain are much younger: the oldest are about 95,000 years old, the most recent, the puy de la Vache and the puy de Lassolas, about 8,500 years old. On a geological scale, that is yesterday.

The puy de Dôme, the main viewpoint

At 1,465 metres, the puy de Dôme is the highest point of the chain. From the summit, you can see the line of cones to the north and south, and to the east the Limagne plain, below the fault. On a clear day, it is the best way to take in the whole site at a glance.

You can go up on foot via the chemin des Muletiers, or take the Panoramique des Dômes rack railway, which runs all year round (times and fares on the Panoramique des Dômes website). We have detailed bus access and times in our article Puy de Dôme and Vulcania without a car. Bring a windproof jacket, even in summer: the summit is often windy and cooler than the city.

Pariou, Lemptégy and the other volcanoes

• The puy de Pariou (1,209 m): its almost perfect crater is about 200 metres across and 90 metres deep. The most popular loop starts from the parking des Goules, on the D941, and is about 6 km long, or 2 hrs 30 mins of walking. Walking down into the crater is forbidden. The car park fills up quickly in high season: arrive early.
• The volcan de Lemptégy: a volcano you visit from the inside, a stone's throw from Vulcania. The visit, on foot or by little train, lasts about 2 hrs 30 mins and goes down to 80 metres below the original ground level, among scoria and volcanic chimneys. The site opens from February to November; check its calendar before you go.
• The puy de la Vache and the puy de Lassolas: the two youngest in the chain, with their breached craters, opened on one side by the outflow of lava.
• Vulcania: the volcano theme park ends its 2026 season on 1 November. The 2027 dates have not yet been published.

Seeing the fault from the city and its surroundings

The fault is easier to read from a little distance. From the plateau de Gergovie, south of Clermont, you can take in the Limagne plain on one side and the edge of the plateau des Dômes on the other. In the city itself, the parc de Montjuzet, on the northern heights, offers a panorama over Clermont, the volcanoes and the plain. To the south-west, the long ridge of the montagne de la Serre can be spotted from the road climbing towards the volcanoes.

To find out more, the site's official page on the UNESCO World Heritage portal gives its full description and map.

Visiting with respect for the site

The listing has brought large numbers of visitors, especially in summer and at weekends. A few simple habits:

• Stay on marked paths: erosion of the scoria slopes is rapid.
• Keep your dog on a lead and take your rubbish home.
• Choose early-morning or weekday starts, for peace and quiet as well as for parking.
• Check the weather: fog descends quickly on the puys, even in summer.

Where to stay to explore the chain

To be as close as possible to the volcanoes, our two Au Cœur des Volcans flats, in Orcines, are at the foot of the puy de Dôme, a few minutes from the Panoramique des Dômes, Vulcania and Lemptégy. If you would rather stay in town and get around by bus, our flats in central Clermont make a good base. The map of properties helps you choose according to your walks. All can be booked from one night, with cleaning and linen included.