Synonyms for sea bottom

ocean floor, deep-sea floor, bottom of the sea, ocean bottom, abyssal depths, ocean depths, continental shelf, undersea topography, undersea park, marine farm, tidewater, the briny deep*; see also ocean.

Structures of the sea bottom include: bank, sands, seamount, submarine mountain, ridge, guyot, hill, tablemount, escarpment, plateau, reef, basin, canal, province, shoal, sill, channel, deep, depth, plain, trench, trough, fracture zone, rift.