the green bridge of wales framed by a gap in the limestone cliff on the pembrokeshire coast, wales near castlemartin

arch bay beach bridge britain carboniferous castlemartin cave cliff clouds coast coastline cove dyfed early framed gap green guillemots gull limestone lush national nature nest park path peaceful pembrokeshire raverbill rock sandstone scenery scenic sea serene shore stack stump summer sunshine tide tourism tranquil travel unique vegetation wales water waves welsh wild