What geographic features isolated in India from the rest of the acient?

India is geographically isolated from the rest of Asia by the formidable Himalayan mountain range to the north, which creates a natural barrier. To the west, the Thar Desert further restricts movement, while the Indian ocean to the south and the Arabian Sea to the southwest provide additional maritime isolation. This unique geography fostered the development of distinct cultures and civilizations within the Indian subcontinent throughout ancient history.