backdrop background beach coast coastal coastline colors colours conservation conserve conserving contrast contrasting cultivation dune-flora dunes environment environmental flora foliage grass grasses green greenery growing growth leafy leaves levels light natural nature ocean ocean-edge ocean-waterline plants salt-resistant sand sand-dunes scrub tides vegetation water waterline path track color colored colour coloured layers rocks rocky rough sea seashore seaside shade shadows shapes shore shoreline shrubbery shrubs Sizes stones stony sunlight sunshine surface surfaces surfacing textured textures tidal tide trees varied variety builders' rubble dumped low tide mangroves outcrop pebbles pollution receding tide rock formations rubble waste