ZIMSEC O Level Geography Notes: Drainage Basin
- The term drainage basin refers to an area of land drained by a river and its tributaries (river system).
- It includes water found in the water table and surface run-off.
- The drainage basin is also known as catchment area among an assortment of terms.
- There is an imaginary line separating drainage basins called a watershed.
- Usually, the watershed is a ridge of high land for example mountains forming a boundary between two adjacent drainage basins.
- The point where a river begins is called the source. It is usually in the form of a lake or spring.
- A confluence is the point where two rivers join.
- A tributary is a stream or smaller river that joins a larger river.
- The mouth is the point where a river enters the sea.
To access more topics go to the Geography Notes page.