tetrapods breakwater with red beacon located in dsme bay with the pier of dsme at okpo, geoje island, gyeongsangnam-do, south

architecture barge bay beacon block boat break breakwater building coast coastal commercial concrete dock dockyard dsme engineering erosion famous geoje gyeongsangnam harbor harbour historical industrial island korea korean large lighthouse marine maritime nautical okpo pier port red sea ship shipbuilding shore south stacked structure tetrapod transport transportation vessel water wharf