the green bridge of wales with lichen-covered rocks in the foreground on the pembrokeshire coast, near castlemartin

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