algae chalk cliff coast England erode erosion face Great Britain green kent landscape low natural nature rock sea seaweed shore sky stone tide white beach blue coastline Cornish cornwall english ocean ridges sand sandy seaside surf water waves coastal enjoy enjoyment fun holiday lava laval leisure madeira pool relax rockpool rocks rocky safe secure swim swimming vacation breaking cracking danger eroding fragmenting splitting cloud clouds colors coruna eu frame galicia horizon horizontal horizontally line linear solid Spain unbroken angler Apulia cove fisherman fishing forest Gargano hobby Italy pastime Ruglia sport woodland architecture defence defensive old security steps tower view boulder clear cool granite inviting islands Maddalena mediterranean refreshing Sardinia shoreline summer