waddenzee near holwerd, friesland, holland

barrier biological bird birds brackish break breaking channels coastal dantziggat dry dutch ebb ebbtide europe european fauna flat friesland gull gulls habitats holland holwerd horizon interactions intertidal landscape low marsh marshes mud mudflats natural nature netherlands outdoor outdoors outside panorama physical pole poles reserve salt sand sandbanks sandbars sandy sea shoals stone stones tidal tide unbroken undisturbed wadden waddenzee water wet wetland