How indian subcontinent cosidered a distinct geographical unit
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The Indian subcontinent is a southern region and peninsula of Asia, mostly situated on the Indian Plate and projecting southwards into the Indian Ocean from the Himalayas. Geologically, the Indian subcontinent is related to the land mass that rifted from Gondwana and merged with the Eurasian plate nearly 55 million years ago Geographically, it is the peninsular region in south-central Asia delineated by the Himalayas in the north, the Hindu Kush in the west, and the Arakanese in the east.[3] Politically, the Indian subcontinent includes Bangladesh, Bhutan, India, Maldives, Nepal, Pakistan and Sri Lanka.
Sometimes, the term 'Indian subcontinent' is used interchangeably with South Asia, although that is typically defined to include Afghanistan as well.[Which countries should be included in either of these remains the subject of debate.