Boulder 



Rounded rock more than 10 in (25.4 cm) diameter; larger than cobblestone. 



Breaker zone 



Zone of shoreline where waves break. 



Breakwater 



Structure protecting shore area, harbor, anchorage, or basin from waves; 

 see jetty. 



Bridge 



Structure erected to span natural or artificial obstacles such as rivers, 

 highways, or railroads and supporting a footpath or roadway for pedestrian, 

 highway, or railroad traffic. A bridge would normally consist of structural 

 members made of steel, concrete, or wood. 



Bridge abutment 



Structure supporting the bridge at the point where the land meets the 

 water as distinguished from a pier which is wholly in the water. 



Bridge pier 



Structure in the water which supports a bridge. 



Bulkhead 



Structure or partition built to prevent sliding of the land behind it. It 

 is normally vertical or consists of a series of vertical sections stepped 

 back from the water. A bulkhead is ordinarily built parallel or nearly 

 parallel to the shoreline. 



Buoy 



A floating object moored to the bottom of a waterway, used for marking, 

 moorage, etc. 



Caisson 



A watertight structure used for construction work in water. 



Calcareous 



Consisting of or containing calcium carbonate. 



Canal 



Artificial watercourse cut through land area. 



Cape 



Relatively extensive land area jutting seaward from continent or large 

 island which prominently marks change or interruption of coastal trend. 



Causeway 



A way of access, or raised road, typically across marshland or water. 

 A causeway would normally consist of an embankment constructed of earth, 

 sand or rock dredged or dumped in place. 



Cliff 



High steep face of rock. 



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