The Mariëndal used to be an agricultural area with straight lines. The nature has taken back control over this area and the sea and wildlife have tranformed the valley. With its beautiful marsches, low dunes, and the presense of many birds the area is a wonderful place to spend your day.
From the information centre De Helderse Vallei you can walk different routes or take a guided tour with a ranger. Tip: bring you binoculars and boots.