<P> The notion of Indigenous Aryans posits that speakers of Indo - Aryan languages are "indigenous" to the Indian subcontinent . Scholars like Jim G. Shaffer and B.B. Lal note the absence of archaeological remains of an Aryan "conquest", and the high degree of physical continuity between Harappan and Post-Harappan society . They support the controversial hypothesis that the Indo - Aryan civilization was not introduced by Aryan migrations, but originated in pre-Vedic India . </P> <P> In recent years, the concept of "Indigenous Aryans" has been increasingly conflated with an "Out of India" origin of the Indo - European language family . This contrasts with the model of Indo - Aryan migration which posits that Indo - Aryan tribes migrated to India from Central Asia . Some furthermore claim that all Indo - European languages originated in India . These claims remain problematic . </P>

What geographic features might have kept indo-europeans separated from each other