La tourbière de Sagne-Redonde

The Sagne Redonde peat bog lies at the bottom of the crater of an ancient volcano created around 2 million years ago. It helps to preserve water resources. An explanatory plaque on the site will give you more information.
Once extinguished, the volcano crater was transformed into a lake, and aquatic plants gradually colonised the shallowest areas. The cold and lack of oxygen limited the work of the micro-organisms responsible for decomposing the plants. As a result, stems, dead leaves and other vegetation gradually accumulated at the bottom of the lake, forming brown peat. Over thousands of years, this natural phenomenon transformed the crater lake into a peat bog. Sagne Redonde has been used for agricultural purposes for a very long time. The peat bog was probably also filled with water in past centuries, as evidenced by the presence of an old dyke downstream from the site. Following the cessation of peat extraction, a number of plant species characteristic of peat bogs have reclaimed the site. These include drosera and bog sedge, two nationally protected plants. The Sagne Redonde peat bog is also a place where many animal species live and reproduce, such as the otter, which finds a veritable larder here when the frogs are spawning. The diversity of dragonflies and butterflies is very high, with 37 and 35 species recorded respectively. Several species of dragonfly observed on the peat bog are particularly rare in the Ardèche or even in the Rhône-Alpes region.

Opening / Rates

Free access.


Hameau de Beauregard
07660 Lanarce
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