Synonyms to firth

arm, armlet, bay, bayou, belt, bight, boca, cove, creek, estuary, euripus, fjord, frith, gulf, gut, harbor, inlet, kyle, loch, mouth, narrow, narrow seas, narrows, natural harbor, reach, road, roads, roadstead, sound, strait, straits, Charybdis, Maelstrom, abysm, abyss, aperture, arroyo, back stream, backflow, backwash, backwater, box canyon, breach, break, broaching, canyon, cave, cavity, chap, chasm, check, chimney, chink, clearing, cleft, cleuch, clough, col, coulee, couloir, countercurrent, counterflow, counterflux, crack, cranny, crater, crevasse, crevice, cut, cwm, deep, defile, dell, depth, dig, diggings, dike, disclosure, ditch, donga, draw, eddy, excavation, fault, fenestra, fiord, fissure, fistula, flaw, flume, fontanel, foramen, fracture, furrow, gap, gape, gash, gat, gorge, groove, gulch, gully, gurge, hiatus, hole, hollow, incision, interval, joint, kloof, lacuna, laying open, leak, lough, maelstrom, mine, moat, notch, nullah, opening, opening up, or