seals resting on sand flats of rif in tidal sea waddensea, netherlands

banner beach coast coastal common dutch ebb europe european flat flats friesland frisian fryslan grey group grypus halichoerus harbor harbour holland landscape low mammals nature netherlands panorama phoca relaxing resting rif sand sandbank sandbar sandflat sea seals seaside shoal silt tidal tide vitulina wadden waddensea waddenzee water wetlands wild wildlife