What is the difference between catchment area and river basin?

Catchment area: A river drains the water collected from a specific area, which is called its catchment area.

River Basin: An area drained by a river and its tributaries is called a drainage basin. A river basin is made up of many different watersheds.

The catchments of large rivers are called river basins, while those of small rivulets and rills are often referred to as watersheds.

Further Reading:

• What are the Parts of a River Called?
• The Major Indian River Systems