A 400-hectare nature reserve stretches across the Holnis peninsula, which is protected by NABU Schleswig-Holstein. The area offers well-protected breeding grounds and a habitat for many animal and plant species. The landscape is characterized by salt marshes where shelducks, oystercatchers, lapwings, little ringed plovers and terns nest. In the middle of the nature reserve, an information hut provides lots of interesting facts about the flora and fauna of the peninsula. There are also up to 10 km of hiking trails through the entire area. These also take you to the cliffs of Holnis Kliff and Holnis Point, from where you have a fantastic view of the fjord and the Baltic Sea.
Just a few centuries ago, the Holnis peninsula was only connected to the mainland of Glücksburg by a narrow strip of land, until the large Holnis Noor was drained and dyked. The water surface of Lake Pugumer See off Schausende originally belonged to the Flensburg Fjord, as did the former bay, which is now separated from the fjord by a spit known as Kleines Noor.