 The current beaches are not a natural feature; the sand that would naturally replenish Coney Island is cut off by the jetty at Breezy Point, Queens.Following the boardwalk's construction, sand has been redeposited on the beaches via beach nourishment, and is held in place by around two dozen groynes.The boardwalk has a steel and concrete foundation supporting wood planking for the walkway, though much of this is no longer visible due to the beach having been raised after the boardwalk was constructed.