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Longemer and its humid plots
In places, the Lake of Longemer's delta is home to swampy plots. The vegetation there is composed of knotweeds and water-plaint buttercups. These marshes of regional interest are essential for the survival of a nationally protected butterfly: the Bistort Copper. The females need the leaves of knotweeds to lay their eggs. This butterfly has almost disappeared from French territory. Partly for that reason, the site is under the protection of the Natura 2000 network.
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