The plateau on the south of Billingen is a nature reserve.

The bedrock throughout the reserve is dolerite. The soil layers are either a thin moraine cover or more or less massive peat layers. Because the dolerite’s flat upper surface is criss-crossed by fractures and hollows, a mosaic landscape has been created, with woodland covering the dryer parts and marshes covering the wetter parts.

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Sydbillingen’s plateau is a nature reserve.