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