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watercourse ![click to hear : watercourse click to hear : watercourse](../../images/speaker-vert.gif)
Natural flow of water that varies in size, depending on the ground slope and the number of tributaries.
spring ![click to hear : spring click to hear : spring](../../images/speaker-vert.gif)
Point where underground water rises to the surface; it may be the source of a watercourse.
waterfall ![click to hear : waterfall click to hear : waterfall](../../images/speaker-vert.gif)
Almost vertical flow of a watercourse, caused by a sudden change in the level of its bed.
lake ![click to hear : lake click to hear : lake](../../images/speaker-vert.gif)
Body of water completely surrounded by land; it varies in size and depth.
effluent ![click to hear : effluent click to hear : effluent](../../images/speaker-vert.gif)
Watercourse from a lake or glacier.
affluent ![click to hear : affluent click to hear : affluent](../../images/speaker-vert.gif)
Watercourse that flows into a larger watercourse or a lake.
confluent ![click to hear : confluent click to hear : confluent](../../images/speaker-vert.gif)
Point where two or more watercourses meet.
meander ![click to hear : meander click to hear : meander](../../images/speaker-vert.gif)
Sinuosity created by a watercourse following a gentle slope.
delta ![click to hear : delta click to hear : delta](../../images/speaker-vert.gif)
Section of the coastline where sediment builds up at the mouth of a river, divided into several arms.
sea ![click to hear : sea click to hear : sea](../../images/speaker-vert.gif)
Vast body of saltwater at some distance inland; it is not as deep as an ocean.
floodplain ![click to hear : floodplain click to hear : floodplain](../../images/speaker-vert.gif)
Level surface bordering a watercourse; it is subject to periodic flooding.
delta distributary ![click to hear : delta distributary click to hear : delta distributary](../../images/speaker-vert.gif)
Channel that a river or stream follows near its mouth; several arms, separated by alluvial deposits, form a delta.
alluvial deposits ![click to hear : alluvial deposits click to hear : alluvial deposits](../../images/speaker-vert.gif)
Sediment (mud, sand, gravel, pebbles) transported and then deposited by a watercourse.
oxbow ![click to hear : oxbow click to hear : oxbow](../../images/speaker-vert.gif)
Meander left behind by the watercourse, forming a crescent-shaped lake.
river ![click to hear : river click to hear : river](../../images/speaker-vert.gif)
Major watercourse fed by numerous smaller rivers; it empties into the sea.
plain ![click to hear : plain click to hear : plain](../../images/speaker-vert.gif)
Vast, relatively flat expanse of land, lower than the surrounding landscape; its valleys are wide and shallow.
valley ![click to hear : valley click to hear : valley](../../images/speaker-vert.gif)
Elongated depression shaped by a watercourse or glacier and bounded by the slopes of the surrounding land.
gorge ![click to hear : gorge click to hear : gorge](../../images/speaker-vert.gif)
Deep narrow valley bounded by steep or very sheer slopes, carved out by a watercourse.
river ![click to hear : river click to hear : river](../../images/speaker-vert.gif)
Natural watercourse of minor or intermediate size that empties into another watercourse.
glacier ![click to hear : glacier click to hear : glacier](../../images/speaker-vert.gif)
Mass of ice resulting from the accumulation and compression of snow; it moves under its own weight.
brook ![click to hear : brook click to hear : brook](../../images/speaker-vert.gif)
Small watercourse fed by a spring, the tributary of a river or a lake.