Question

what is rain shadow region....

Answer 1

A rain shadow is the dry region of land on the side of a mountain range that is protected from the prevailing winds.

Answer 2

When moisture-laden winds blow towards the mountains, they strike the windward side of the mountains and causes rainfall. When these winds blow towards the other side of the mountains, they are completely devoid of any moisture and do not bring rainfall. This area is known as the rain shadow region.