Barmouth beach boat bridge buoys Causeway coastline estuary gantry girders hills line low mountains Mud pillars railway resort sand sea shore tidal tide wales water welsh yacht alone autumn bay beauty calm coast exercise Gower island landscape lonely nature peace promontory quiet Rhossili single solitude tranquil walk wave color colored colors colour coloured colours layers levels light low-tide ocean open-area rocks rocky rough seashore seaside shade shadows shapes shoreline Sizes spray stones stony sunlight sunshine surf surge surging tides variety waves wet adults children distance distant expanse families low tide open area pebbles people recreation relaxing strolling sunset waders wading walking builders' rubble dumped growing growth mangroves natural outcrop plants pollution receding tide rock formations rubble waste waterline aerial aerial roots dunes glistening glossy green greenery mangrove growth ocean edge ocean waterline receded receding root network Roots salt-resistant sand dunes scrub security strength strong support