blue boulder boulders granite island islands land landscape Maddalena mediterranean mountain natural nature pink rock rocky rough rugged Sardinia sea shore shoreline view water aquamarine bay coast energetic energy fierce inlet Maddalena Islands powerful strong summer wave bottom destination distance distant holiday horizon leisure peace placid relax ripple clear coastline cool inviting refreshing vacation anchorage anchored boat dinghy mast moored pleasure rest sail sailing sport tourism yacht abundant covered dried eerie marine maritime matted Neptune-weed odd plant Posidonia Remains sea-grass strange unusual vegetation gray grey sky isthmus spit carved coastal eroded erosion form formation macabre ship trawler weird tide