Question

which three river systems form the northern plains of India​

Answer 1

The Ganga is the most important river in the Northern plains. The river originates as Bhagirathi from a glacier called Gangotri, in the Himalayas. On its way down the hills, Alaknanda and Mandakini rivers join Bhagirathi. The combined waters of these three rivers become the mighty Ganga.

Answer 2

Answer:

Indus, Brahmaputra and Ganga

hope it helps u....^_^