Marais Des Sagnes, Nature reserve and wetland in Le Sappey-en-Chartreuse, France
The Marais des Sagnes is a nature reserve and wetland set in a small valley near the village of Le Sappey-en-Chartreuse, in the Chartreuse massif. It is made up of three distinct zones: wet meadows with orchids, reed beds with tall grasses, and patches of willow woodland.
The wetland formed over a long period through the gradual build-up of water and plant matter in a mountain valley of the Chartreuse massif. Active conservation work, such as digging small ponds and mowing meadows, began more recently to support the natural development of the site.
A raised wooden boardwalk runs through the Marais des Sagnes, letting visitors walk over the wet ground without disturbing the soil. Every month, nature guides lead a free tour where participants can spot dragonflies, water birds, and rare orchids up close.
The site is open year round, though spring and summer offer the best conditions for spotting flowers and birds. Sturdy footwear is recommended, and visitors are asked to stay on the marked paths, as the ground away from the wooden boardwalk can be very wet.
The Marais des Sagnes is considered the largest suspended marsh at this altitude in the Chartreuse massif, which is rare for a mountain area. Among the plants found here is the Traunsteiner's Orchid, a species that grows in only a handful of spots across the Alps and flowers in May and June.
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