wadi

wadi
    n 1: gully or streambed in northern Africa and the Middle East
         that remains dry except during rainy season
    

147 Moby Thesaurus words for "wadi":
      abysm, abyss, adolescent stream, aqueduct, arroyo, beck, bed,
      bottom, bottom glade, bottoms, bourn, box canyon, braided stream,
      branch, breach, break, brook, brooklet, burn, canal, canyon,
      cavity, channel, chap, chasm, check, chimney, chink, cleft, cleuch,
      clough, col, coulee, couloir, crack, cranny, creek, creek bed,
      crevasse, crevice, crick, culvert, cut, cwm, dale, defile, dell,
      dike, dingle, ditch, donga, draw, dry bed, excavation, fault,
      fissure, flaw, flowing stream, flume, fluviation, fracture, fresh,
      freshet, furrow, gap, gape, gash, gill, glen, gorge, groove, grove,
      gulch, gulf, gully, gullyhole, headrace, hole, incision, intervale,
      irrigation ditch, joint, kill, kloof, lazy stream, leak,
      lunar rill, meandering stream, midchannel, midstream, millstream,
      moat, moving road, navigable river, notch, nullah, opening, pass,
      passage, race, racing stream, ravine, rent, rift, rime, river,
      river bed, riverway, rivulet, run, rundle, runlet, runnel, rupture,
      scissure, seam, sike, slit, slot, sluice, spill stream, spillbox,
      spillway, split, strath, stream, stream action, stream bed,
      streamlet, streamway, subterranean river, swash, swash channel,
      tailrace, trench, trough, vale, valley, void, water carrier,
      water channel, water furrow, water gap, water gate, watercourse,
      waterway, waterworks