the impressive natural arch made from carboniferous limestone, know as the green bridge of wales on the pembrokeshire coast

arch bay beach bridge britain carboniferous castlemartin cave cliff clouds coast coastline cove dyfed early geo green guillemots gull impressive know landscape limestone lush made national natural nature nest ocean park path peaceful pembrokeshire rock sand sandstone scenery scenic sea serene shore sky stack summer tide tourism tranquil unique vegetation wales water waves welsh wild