blue cape coastline gray horizon line Nariga nature ocean roches rock rocks saavem sea sky water algae beach cliff eroded erosion Great Britain hillside natural Pembrokeshire sand seaweed shore united kingdom view wales welsh coastal danger edge island summer surf wild calm cloud Cornish cornwall England english harbour Ives lighthouse peaceful placid ripples saint St. Ives anchorage green moored Skomer yacht Balearic Islands boulders dangerous harsh majorca mediterranean rough rugged Spain spanish spray spume waves white coast gravel pattern pebble pebbles soak stone stones texture wet guard HDR life Nyberg safety tower clouds sun sunset boulder low tide sandy