Synonyms to pelagic zone

abyss, Bassalia, Gehenna, Sheol, Tophet, abysm, abyssal zone, arroyo, bathyal zone, benthos, bottom waters, bottomless depths, box canyon, breach, break, canyon, cavity, chap, chasm, check, chimney, chink, cleft, cleuch, clough, col, coulee, couloir, crack, cranny, crater, crevasse, crevice, cut, cwm, deep, deepness, defile, dell, depth, dig, diggings, dike, ditch, donga, draw, excavation, fault, fissure, flaw, flume, fracture, furrow, gap, gape, gash, gorge, groove, ground, gulch, gulf, gully, hades, hole, hollow, incision, inferno, inner space, joint, kloof, leak, mine, moat, netherworld, notch, nullah, ocean bottom, ocean depths, ocean floor, opening, pass, passage, perdition, pit, profoundness, profundity, quarry, ravine, rent, rift, rime, rupture, scissure, seam, shaft, slit, slot, split, the deep, the deep sea, the deeps, the depths, trench, underworld, valley, void, wadi, well, workings, yawning abyss, big drink, blue water, drink, high sea, high seas, hydrosphere, main, main sea, ocean, ocean b