beach coast Dorset England english gentle Great Britain natural environment ocean outgoing retreating sand sea shore Studland tide water wave chalk cliff coastline erosion gravel groyne kent shingle St Margaret's Bay view bay blue cyprus inlet landscape mediterranean mountain natural nature shoreline summer boulders Lofoten Islands mountains norway norwegian rocks seagulls stones wild horizon waves arch face hole low peephole sky stone beak bird coastal eye feathers feet foot gull herring gull Larus argentatus seagull anger angry break crash danger dangerous spray spume Sussex violence violent canada evening forest Vancouver Island