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An FFH protected area of almost 150 hectars that contains one of the largest contiguous calcareous grasslands in northern Germany.
The Stahlberg and Hölleberg area is dominated by well-preserved calcareous grasslands in different stages of succession and interesting for breeding birds of semi-open habitat, including Cuckoo, Common Quail, Common Nightingale, Skylark, Eurasian Green Woodpecker, Grasshopper Warbler, Red-backed Shrike, Tree Pipit, Wood Lark and Wryneck. Visitors are Black Kite and Red Kite, Black Stork, Common Raven and Eurasian Hobby. The area is also a well-known hotspot among botanists (orchids) and entomologists (e.g. butterflies).
The site is accessible by car, there is a parking possibility at the airfield Hölleberg. From there, several hiking routes lead along the plateau which offers a scenic view over the Diemel valley. The length of the route you see on the map is about 7 km.