In October 2010, a beautiful nature reserve was opened to hikers. The Marum is the part of the large shooting field on the left side of the track to Brecht. It was closed to the public for more than a century because it was used as a training ground for the military. Now the army no longer needs the area and the beautiful, unspoilt nature reserve has been opened to hikers.
ANB (Nature and Forest Agency) has constructed and signposted several hiking trails. The yellow route runs straight through the area, the red route follows the perimeter of the Marum. Due to the vulnerability of the area (with many rare birds and amphibians), there are important restrictions for hikers. Dogs are always prohibited in the inner area (yellow walk) (even on a leash) and walking is not allowed during the breeding season from mid-March to mid-June. These restrictions do not apply on the red walk.