sailing with catamaran over dutch waddenzee

biological bird birds boat brackish catamaran channels coast coastal dry dutch ebb ebbtide europe european fauna flat forage foraging freetime friesland fun gull gulls habitats holiday holidays holland horizon interactions intertidal island landscape low marsh marshes mud mudflats natural nature netherlands outdoor outdoors outside panorama physical pleasure relax relaxing reserve rottumeroog rottumerplaat sail sailing salt sand sandbanks sandbars sandy sea seasonal ship shoals shore sport tidal tide undisturbed wadden waddenzee water wet wetland