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The lakes of Montcineyre, Bourdouze and Estivadoux from Lac Pavin

This hike takes you to four volcanic lakes: Lac Pavin, which is 92 metres deep and 700 to 800 metres in diameter; Lac de Montcineyre, formerly owned by the Michelin family; Lac de Bourdouze, which is partially covered by peat bog; and finally Lac de l'Estivadoux, which is almost completely dry.
Lac Pavin and Lac de Montcineyre from Besse

Hike in the Auvergne Volcanoes Park, starting from Besse (located an hour's drive south of Clermont-Ferrand). The discovery trail starting from the Hôtel le Clos combines wooded areas and open countryside, passing by Lake Pavin and Lake Montcineyre (swimming is prohibited in both).
The trail is very well marked throughout (markings and signs).