tributaries, headwater, rivers, watersheds, lakes, creeks, aquifer, bottomland, river basin, estuary, oxbow, groundwater, wetlands, floodplain, basin, drainage basin, waterways, flowage, freshwater, reservoir, dam, tailrace, mattole, embayment, apalachicola river, moraine, shoreline, watercourse, tidal basin, salmon trout, tidewater, ozark plateau, murrumbidgee river, riparian forest, bighorn river, tableland, tallapoosa river, reservior, sediment, esker, titicaca, catchment, freshwater mussel, landlocked salmon, lowlands, streambed, forebay, brahmaputra river, ponds, flood plain, coastlands, oxbow lake, selkirk mountains, downstream, escarpment, great dividing range, millrace, coulee, drumlin, sudd, tsangpo, diking, cataract canyon, mudflat, brook trout, bioregion, karst, riverbed, uplands, sawatch, paramo, bull trout, tarn, silt, marsh, foothills, amu darya, parana river, marshes, salween, highlands, barrens, penobscot river, cutthroat trout, rainbow smelt, limber pine, outfall, hellbender, weirs, seacoasts, squawfish, heronry, arroyos, brown trout, acequia, blackwater, waterpower, riverbank, cayuga lake, habitat, valley, hydrological, fastnesses, valleys, drainages, streams, catchments, counties, mountains, oases, reaches, watershed, plateaus, pueblos, ranges, continents, arid, baikal, easternmost, glaciated, indus, inundated, nile, northerly, northwestern, rhine, unglaciated, unsurveyed, yangtze, annexed, appalachian, auriferous, congested, cordilleran, corresponding, danube

lake victoria, victoria nyanza

beginning, origin, root, source