The Himalaya, Karakorum, and Hindu Kush mountain ranges separate the South Asian subcontinent from the rest of Asia. The Himalayas, the highest mountains in the world, extend 1,500 miles west from the Brahmaputra River to the Karakorum, a mountain range that extends 300 miles.
Ang mga bukirin ay natutulungan ng mga ilog na nagmumula sa Himalayas at umaagos sa Indus, Brahmaputra at Ganges.
