Sigadoux (ruisseau) - Affluent du Lavaud walks

This sixth stage takes you gently closer to the city of Clermont-Ferrand, passing through the hamlet of Villars, which has preserved its beautiful old buildings, before following the stunning Chemin des Crêtes, overlooking the Tiretaine valley, to reach the old village of Royat.

On 19 September 1648, Blaise Pascal stood before his Torricelli tube in the Jardin des Minimes – now Place de Jaude – in Clairmont (Clermont). His brother-in-law, Florin Périer, had set off earlier with his own Torricelli tube for the summit of the Puy de Dôme. Over the course of the day, 17 experiments were carried out to measure the mercury level in the tubes, which had been placed at different altitudes; these experiments would go on to confirm the hypothesis of the “weight of the air”, which would later become known as atmospheric pressure. At both locations, once filled to the brim, the tube was turned upside down so that its open base was in contact with the mercury contained in a vessel. Due to its weight, the liquid inside the tube dropped under the effect of gravity. In Clermont, the mercury remains at a height of 71.2 cm. At the summit of the Puy de Dôme, it drops to 62.70 cm. This difference of a few centimetres is the result of a height difference of 1,078 metres, which I invite you to appreciate for what it is.

On 19 September 1648, Blaise Pascal stood before his Torricelli tube in the Jardin des Minimes – now Place de Jaude – in Clairmont (Clermont). His brother-in-law, Florin Périer, had set off earlier with his own Torricelli tube for the summit of the Puy de Dôme. Over the course of the day, 17 experiments were carried out to measure the level of mercury in the tubes, which had been placed at different altitudes; these experiments would go on to confirm the hypothesis of the ‘weight of the mass of air’, which would later become known as atmospheric pressure. At both locations, once filled to the brim, the tube was turned upside down so that its open base was in contact with the mercury contained in a vessel. Due to its weight, the liquid inside the tube sank under the force of gravity. In Clermont, the mercury remained at a height of 71.2 cm. At the summit of the Puy de Dôme, it dropped to 62.70 cm. This difference of a few centimetres is the result of a height difference of 1,078 metres, which I invite you to appreciate for what it is.

This first stage is mainly urban, with a few green interludes at Parc Bargoin in Chamalières, on the slopes of Puy de Montaudoux, in the chestnut grove of Beaumont and in the small parks along the Artière.

Exploratory walk through the neighbourhoods north of Clermont's central plateau, discovering recent street art (2022).

An urban itinerary to discover the beautiful late 19th and early 20th century buildings in the eastern districts of Clermont-Ferrand city centre.

This seventh and final stage, which is partly urban, allows you to continue exploring Royat, which you started at the end of the previous stage, first in the wooded hills of the town, passing by the Rocher du Salut promontory, then through the streets and park of the spa district, with its beautiful seaside architecture. Finally, the return route to Clermont allows you to discover the centre of Chamalières.

How do you cover a bit over 1,500 metres of elevation gain in the Chaîne des Puys, which, to true mountaineers, are nothing more than hills? By walking just over 30 km from the Louchadière hikers’ car park to the Col de Ceyssat, passing via the summits of eight puys: Louchadière, Jume, Coquille, Gouttes, Goules, Pariou, Cliersou and Dôme. This is therefore a one-way hike, requiring you to leave a vehicle at the Col de Ceyssat before returning to the starting car park. The route is challenging due to its length and elevation gain, but presents no technical difficulties. Some sections on unmarked forest paths require the use of the Visorando app. It would be unwise to get lost over such a long distance.

A fairly short second stage between Beaumont and Ceyrat, passing by the pretty Moulin de la Tranchère, a renovated mill on the banks of the Artière, then by the summit of Puy de Montrognon, crowned by a tower that is the remains of a medieval castle.

A pleasant, easy walk in the Chaîne des Puys. There are magnificent views of the Puy de Dôme to admire.This walk requires two cars.