Question

Classify the northern plains on the basis of rivers

Answer 1

THE INDUS , THE GANGA  AND THE BRAHMAPUTRA

Answer 2

Besides the longitudinal divisions, the Himalayas has been divided on the basis of river valleys from west to east.
1) The part of Himalayas lying between Indus and Satluj has been traditionally known as Punjab Himalayas, but regionally known as Kashmir Himalayas or Himachal Himalayas.

2) The part of Himalayas lying between Satluj and Kali rivers is known as Kumaon Himalayas.

3) The Kali and Tista rivers demarcate the Nepal Himalayas

4) The part lying between Tista and Dihang rivers is known as Assam Himalayas