"Apart from its silence on a former homeland, or immigration, the RV contains positive indications about the Áryas’ very long presence in Saptasindhu. Hymn X, 75 gives a list of names of rivers not in the order west-to-east, as we would expect from invaders advancing in that direction, but from east- to-west, as of a people long settled and having the east as a starting point of reference. Then there are passages expressing the Aryans’ strong sense of being rooted in their lands when they recall their ancestors taking their place in the sacrifice “here”, like the Angiras family (IV, 1, 3) or the Vasis†has (VII, 76, 4), etc."
January 1, 1970
https://en.wikiquote.org/wiki/Rigvedic_rivers