Total length of Indian coast is 7,517 km (4,671 miles)

On the south, India projects into and is bounded by the Indian Ocean – in particular, by the Arabian Sea on the southwest, the Laccadive Sea to the south, and the Bay of Bengal on the southeast. The Palk Strait and Gulf of Mannar separate India from Sri Lanka to its immediate southeast.

source: https://en.wikipedia.org/wiki/Geography_of_India