revetment, seawall, jetties, piers, groyne, pilings, reefs, embankments, sandbanks, shoreline, riprap, bulkheads, wharfs, sandbars, weirs, dredging, beach erosion, seaward, shoal, groins, mangroves, retaining wall, berms, cofferdam, causeway, outfall, caissons, coral reef, fishway, intertidal, seagrass, dikes, pontoons, gabion, dunes, anchorages, lagoon, marina, landward, islands, eelgrass, sedimentation, mudflat, marram grass, gabions, freeboard, polders, docks, shorefront, buoys, headlands, mooring, ebb tide, coquina, levees, headstay, drawbridges, slipway, crossbeams, fortifications, quay, tides, bailey bridge, menai strait, archipelagos, falsework, estuary, gaillard cut, coastland, gobies, monopoles, inlet, coastlines, beachfront, coastal, intracoastal waterway, roadbeds, salt marsh, shipworms, cultch, bulrushes, marquesas islands, seabed, fringing reef, ahu, waterline, lighthouse, dry dock, landmasses, wetlands, graving dock, masts, riverbanks, reservior, promontories, canals, silt, kattegat, dam, halyards, spadefish, breakwater, dams, abutments, embankment, stacks, anchors, causeways, cylinders, earthworks, pillars, aqueducts, bastions, bridges