<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (July 2010) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (July 2010) (Learn how and when to remove this template message) </Td> </Tr> <P> Central Asia and Ancient India have long traditions of social - cultural, religious, political and economic contact since remote antiquity . The two regions have common and contiguous borders, climatic continuity, similar geographical features and geo - cultural affinity . There has always been uninterrupted flow of people, material and the ideas between the two . </P> <P> Migration of peoples and tribes from Central Asia into India, and expansion of Central Asian empires into India, is a recurring theme in the history of the region, from the theorised Indo - Aryan migration, to the Iron Age Kushan Empire, the Indo - Scythians, the Indo - Greeks (via Bactria) and the medieval Islamic conquest of the Indian subcontinent . Intrusion is typically across the Hindukush, and influence of the intrusive population is first established in the Punjab region, and sometimes further expanded into the Ganges Plain . These views of migration and the tribes as immigrants is subject to dispute as being historical corruption . </P>

Impact of india's contact with the central asia