1. Spatial spread of the Himalayan mountain
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2. Bangladesh is a natural extension of India.
That is why it sits within India's armpit, and there are no natural barriers between India and Bangladesh.
Bangladesh is infact one the artificial countries that was created by British after divisions of Bengal.
Modern India did not exist but India subcontinent has existed for hundreds of millions of years.
It sits all together on different tectonic plate than the Eurasian tectonic plate.
When Indian subcontinental plate crashed into Eurasian continental plate..it led to the rise the Hindu Kush mountains and Himlayas. Creating a natural barrier from rest of Asia.
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