pile of gray breakwaters cement coast guard against the sea large stone triangles powerful weather-beaten

against background barricade barrier block blue break breakwater breakwaters cement coast coastal coastline concrete construction dam danger element embankment gray grey groyne guard harbor heap heavy landscape large line many massive nature ocean outdoor pattern pier pile port powerful protect protection quay rock safe safety sea seawall shape shore solid stone storm strong structure surface texture tide triangle triangles wall water waterfront wave weatherbeaten