The nature reserve "Geltinger Birk" is located on the north-eastern tip of fishing, at the output of the Flensburg Fjord. It has a total area of 773 hectares, the largest protected area in the district of Schleswig - Flensburg. Mill 'Charlotte' welcomes visitors at the entrance.
Since 2002 this area is home for Konik horses. You can also see Highland Cattle which are also used on the Birk for landscape maintenance.