couloir

a narrow opening between hillsides or mountains that can be used for passage at one point the steep, ice-encrusted walls of the couloir are no more than 50 feet apart Synonyms col, canyon, defile, flume, gap, gill [British], gorge, gulch, gulf, kloof [South African], linn [chiefly Scottish], notch, pass, ravine, saddleRelated 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]