canyon

a narrow opening between hillsides or mountains that can be used for passage as the scouts made their way through the canyon, they marveled at the sheer walls of rock on both sides Synonyms col, couloir, defile, flume, gap, gill [British], gorge, gulch, gulf, kloof [South African], linn [chiefly Scottish], notch, pass, ravine, saddle Related Words abyss, chasm, cirque, cleft, crevasse, crevice, cwm [chiefly British], fissure; combe (also coombe or coomb) [British], dale, dell, glen, hollow, shut-in, vale, valley; basin, floodplain, kettle; arroyo, barranca (also barranco), coulee, draw, gully (also gulley), gutter, nullah, trench, trough, wadi, wash [West]