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In page Geography of India:

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An arc of mountains consisting of the Himalayas, Hindu Kush, and Patkai ranges define the northern frontiers of the Indian subcontinent.[1] These were formed by the ongoing tectonic plates collision of the Indian and Eurasian plates. The mountains in these ranges include some of the world's tallest mountains which act as a barrier to cold polar winds. They also facilitate the monsoon winds which in turn influence the climate in India. Rivers originating in these mountains flow through the fertile Indo–Gangetic plains. These mountains form the boundary between two biogeographic realms: the temperate Palearctic realm that covers most of Eurasia, and the tropical and subtropical Indomalayan realm which includes South Asia, Southeast Asia and Indonesia.[citation needed]