people walking on mudflat and tideway marked with wooden poles at low tide of waddensea near schiermonnikoog, netherlands

active channel coast coastal creek dutch ebb europe european flat flats friesland frisian gullies gully holland horizon island landscape leisure low mud mudflat mudflats nature netherlands panorama people poles recreation sand sandflat sandflats schiermonnikoog sea tidal tide tideway travel vacation wadden waddensea water west wetland wetlands wooden