How has the Physical geography of India kept it separate from the rest of Asia for most of its history?

India's physical geography, characterized by the towering Himalayas to the north, extensive deserts in the west, and the surrounding Indian ocean, has historically acted as a natural barrier, isolating it from the rest of Asia. The mountain ranges hindered invasions and migration, while the ocean facilitated maritime trade rather than land-based interactions. This isolation allowed India to develop a unique culture and civilization, distinct from its Asian neighbors. Additionally, the diverse terrain created varying climates and ecosystems, further fostering regional differences within the subcontinent.