Question

Which mountain ranges form a dividing line between the ganges plain and the deccan plateau

Answer 1

The Vindhya range divides the ganges plain and deccan plateau.

Answer 2

Both Vindhya and Satpura ranges forms the dividing line between the deccan plateau and the ganges plain.

When it comes to Vindhya Range, it is the discontinuous and complex chain of  the mountain ridges, highlands, plateau escarpments and much more in the regions of west-central India.

The precise extent of Vindhyas is defined loosely, and traditionally, the term actually covered many hill systems.