Drainage basin - the area of land drained by a river.
Catchment area - the area within the drainage basin.
Watershed - the ridges of highland surrounding a drainage basin. It marks the boundary between two drainage basins.
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- Water falling either side of these ridges will go into different drainage basins.
Source - where a river starts, usually in an upland area (e.g. mountains).
Confluence - the point at which two rivers or streams join.
Tributary - a stream or smaller river which joins a larger stream or main river.
Mouth - the point where the river comes to the end, usually when entering the sea or a lake.
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