Behind the dunes, just south of Callantsoog lies the nature reserve "Zwanenwater". The landscape consists of dunes, plains, swamp, pine forest and two lakes surrounded with overgrowth. Through a trail, 2 or 4 ½ miles, gives the visitor an idea of the landscape and the variety of plants and birds. Dogs are not allowed. Members have free access. Non-members pay € 1.50 at the entrance (automatic). Children under 12 are free.