troughs Definition

gutter, basin, till, bowl, manger, public treasury, valleys, depressions, lows, lagoons, ponds, pools, hollows, raceways, depths, basins, booms, ditches, shallows, cavities, trenches, eave, watersheds, voids, pits, downs, privies, graves, kneading, recesses, drinkers, catchments, drainages, peaks, bottoms, rills, hummocks, wadis, sine curve, eddies, hutches, billabongs, dips, promontories, tubs, outwash, corrugations, rockeries, gullies, cusps, fantails, estrous, cirques, byre, escarpments, knolls, feeders, flumes, downtrend, fibonacci, cycles, crests, ruts, parabola, tarn, asthenosphere, anticyclones, alcoves, poddy, pots, waterer, farrowing, metritis, crosspieces, bilaterally symmetrical, eskers, ridging, tussocks, namoi river, calve, bergs, fenland, copses, highs, tasman sea, weirs, kelpies, anticlines, fords, seracs, swayback, bulls, soakaway, ironstone, spume, pullbacks, plateaux, seacoasts, sluices, stiles,