beach calaliberotto drift longshore orosei sand Sardinia sea wave waves west coast winter clouds Emerald Isle gray hurricane NC North Carolina summer usa bathing female girl ocean sunbathing swimming woman blue coastline grey inlet sky Tan waterway white holiday holidaying holidays island islands resort resorts sun tropical tropics birds coast colors colours dune-flora dunes grass grasses green greenery growing growth gulls levels low tide natural ocean edge ocean waterline pelicans plants receded receding receding tide rough salt-resistant sand-dunes Sandbar scrub seabirds seagulls tidal tides vegetation water waterbirds waterline background concrete floor mosaic rock rocks stone stones texture tile walk wallpaper legs seaside standing vacations young