The Indian subcontinent is the land mass south of the Himalayas and a part of South Asia. Most of the region is occupied by Indian territory, other states with territorial interests in the subcontinent are Bangladesh, Bhutan, Nepal, Pakistan and Sri Lanka. Geographically, the Indian subcontinent can be described by the two streams Indus and Ganges as a natural boundary; the eponymous Indus is 3180 km, the longest river in the subcontinent, it is the most important power in Pakistan; the Ganges ( 2511 km long) is the main river in India and Bangladesh.
This region is referred to as " sub-continent " because the land mass not part of the Eurasian plate, but a part of the Indian plate. In the Earth, this land mass was part of a lithospheric plate, which broke away from Gondwana supercontinent and moved from the southern hemisphere to the north. As a result of the collision with the Eurasian Plate, the Himalayas folded up and there was a land connection with Asia.