Question

list areas receiving less than 20 cm rainfall in India

Answer 1

wastern if you are talking about india

Answer 2

In India, the districts which get rainfall lesser than 20 cm embrace  Northern Kashmir, Punjab Western Rajasthan, and,  Deccan Plateau.

The Thar Desert region which is positioned at the leeward side of the great Aravalli mountains also holds less than 20 cm precipitation. This is because the Arabian Sea breezes flow in a laterally direction to the Aravalli mountains.