beach foam ocean power sand swell tidal tide water wave waves beige brown damp low ripples texture wet yellow bay coastline flats Lofoten Islands mountains Mud norway norwegian rural sea seaweed shore clouds deserted distance groyne sky summer walk coast color colored colors colour coloured colours layers levels light low-tide open-area rocks rocky rough seashore seaside shade shadows shapes shoreline Sizes spray stones stony sunlight sunshine surf surge surging tides variety