One of the valuable nature areas in the district of Gross-Gerau and one of the last wetlands in Southern Hesse is the "Mönchbruch" by Mörfelden and Rüsselsheim.
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The mixture of large wet meadow areas and old alder and oak forests in the 937 hectare sized Nature Reserve Mönchbruch provides a habitat for many rare animal and plant species. For millennia, Mönchbruch has preserved its own charm. The nature reserve has in its center a unique historico-cultural memorial, the old hunting lodge.