The area of high land forming the edge of a river basin.
Source
Where the river begins.
Mouth
Where a river meets the sea.
Confluence
The point at which two rivers meet.
Tributary
A small river or stream that joins a larger river.
Channel
This is where the river flows.
Basics of drainage basins
A drainage basin is the area of land drained by a river and its tributaries, sometimes referred to as a river catchment. The boundary of a drainage basin is defined by the watershed.
