What forms the border between northern India and China

The northern frontiers of India are defined largely by the Himalayan mountain range, where the country borders China, Bhutan, and Nepal. Its western border with Pakistan lies in the Karakoram range , Punjab Plains , the Thar Desert and the Rann of Kutch salt marshes.

Explanation:

could you go a bit more in depth with you question? it's quite hard to understand. as soon as you do that i will be glad to : )

answer functional age;