There is a strong presumption in favor of (Indian) tradition; if anyone contests tradition, the burden lies on him to show that it is wrong. - Frederick Eden Pargiter

Tradition… makes the earliest connexion of the Veda to be with the eastern region and not with the Punjab.

One branch, headed by Uśīnara established several kingdoms on the eastern border of the Punjab [...] his famous son Śivi originated the Śivis [footnote: called Śivas in Rigveda VII.18.7] in Śivapura, and extending his conquests westwards [...] occupying the whole of the Punjab except the northwestern corner.

"If the Aryans had entered India from the north-west, and had advanced eastward through the Punjab only as far as the Saraswati or Jumna when the Rigvedic hymns were composed, it is very surprising that the hymn arranges the rivers, not according to their progress, but reversaly from the Ganges which they had hardly reached. " Imam me gange yamune sarasvati sutudri stomam sacata parusnaya asiknya marudvrdhe vitastayarjikiye srnuhya susomaya " (x 75.05) O Ganga, Yamuna, Sarasvati, Sutudri (Sutlej), Parushini (Ravi), hear my praise! Listen to my call, Asikni (Chenab), Marudvridha (Maruvardhvan), Vitasta (Jhelum) with Arjikiya, Sushoma (Sohan).