There are 12 major river basins with a catchment area of 20000 km2 and above. They are

• Brahmaputra River Basin
• Cauvery River Basin
• Godavari River Basin
• Indus River Basin
• Krishna River Basin
• Mahanadi River Basin
• Mandovizuari River Basin
• Narmada River Basin
• Pamba River Basin
• Tapi River Basin
• Narmada River Basin
• Mahi

The major river basin is the Ganga-Brahmaputra-Meghna, which is the largest with a catchment area of about 11.0 lakh km2 (more than 43% of the catchment area of all the major rivers in the country).

Further Reading:

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