Question

Why do we often use the term Indian peninsula

Answer 1

because India is surrounded by water bodies on three sides.
The land which is surrounded by 3sides water and one side land is called Peninsula.

Answer 2

Hello friend.

A land which is surrounded by water in its three sides is called as a peninsula

We normally use the term Indian peninsula as India is surrounded by water in its three sides

Arabian sea to the west, bay of Bengal to the east and Indian ocean to the south.

Hope it helps!!