A boat-building establishment. An extreme case of swamp or morass. Clear cut, cf abrupt . Also, a barrier of hawsers and nets supported by buoys used in the defence of a port or anchorage. The area is usually enclosed by a boom to retain the logs.
Formation is most apparent in wedge-shaped shoaling estuaries at times of spring tides.
See Admiralty Manual of Tides . A solid structure, such as a wall or mole, to break the force of the waves, sometimes detached from the shore, protecting a harbour or anchorage. Vessels usually cannot lie alongside a breakwater. Structure carrying road etc across waterway, road ravine etc. Movable bridges are usually swing bridges, or lifting or bascule bridges.