aquamarine bay blue clear coast destination holiday island islet landscape leisure Maddalena natural nature relax ripple rock Sardinia sea shallow shore summer vacation view warm water boats boulder broken Catalan catalonia Catalunya coastline costa brava cracked damaged danger fissured fractured hazard mediterranean rocks Spain spanish worn Armeria cliff clifftop Cornish cornwall England english flora flowers Great Britain green horizon islands islets spring thrift stacks Balearic Islands boisterous churn fierce majorca rocky rough rugged stone swirl tide waves algae beach ocean resort sand sandy seaweed surf Barmouth boat bridge Causeway estuary gantry girders hills line low mountains Mud pillars railway tidal wales welsh yacht family fun Jetty kent play sky tourism wave hillside seethe seething wild