Why is the deccan much drier then the coastal plains?

The Deccan Plateau is much drier than the coastal plains primarily due to its elevated topography and distance from moisture sources like the ocean. The Western Ghats and Eastern Ghats create a rain shadow effect, where moist air from the sea is blocked by the mountains, resulting in heavy rainfall in coastal areas but significantly less in the interior. Additionally, the Deccan's semi-arid climate contributes to lower precipitation levels compared to the more humid coastal regions.