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750m long and featuring 23 markers, the Ditch Trail allows you to explore some of the flora and fauna present in a typical alder and ash plantation. Crossed by the river ""Otter"", the path is laid out in a wetland where some 80 ditches have been identified. Tables are installed close to the arboretum for picnics and educational work. Nearby are a typical Sundgau orchard and some ponds. The trail is accessible from the Porte d'Alsace reception area.