The South Indian rivers are not navigable. Why?? Give reasons!
Here is your answer,
The rivers of Peninsular India are not suitable for navigation as they flow swiftly over the plateaus and highlands.
The rivers in South India are rain-fed and dry up in the hot and dry season. The peninsular rivers of the south have their source in the Western Ghats and flow across hills making a number of waterfalls, which are not navigable, but provide Hydro-electricity.
Hope it helps