It is important for the reconstruction of the geography of the Vedic civilization. Sindhu (the Indus) is addressed as the mightiest of rivers and addressed specifically in verses 1, 2, 7, 8 and 9 contrary to the mighty river of Sarasvati in the old books of 6, 3, and 7.
In verse 5, the rishi enumerates ten rivers, beginning with the Ganga and moving westwards: O Ganga, Yamuna, Sarasvati, Shutudri (Sutlej), Parushni (Iravati, Ravi), follow my praise! O Asikni (Chenab) Marudvridha, Vitasta (Jhelum), with the Arjikiya (Haro) and Sushoma (Sohan), listen!
Verse 6 adds northwestern rivers (tributaries of the Indus flowing through Afghanistan and north-western Pakistan),
"First thou goest united with the Trishtama on this journey, with the Susartu, the Rasa, and the Sveti, O Sindhu with the Kubha (Kophen, Cabul river) to the Gomoti (Gomal), with the Mehatnu to the Krumu ( Kurum) with whom thou proceedest together."
Griffith translates: "First united with the Trishtama in order to flow, with the Susartu and Rasa, and with this Svetya (you flow), O Sindhu (Indus) with the Kubha (Kabul R.) to the Gomati (Gomal), with the Mehatnu to the Krumu (Kurram), with whom you rush together on the same chariot."
More recent interpretations take the arrangement to corresponds to the eastward expansion of the Vedic culture. Recent linguistic reconstruction suggests that Book 6 is one of the earliest of the Rigveda, while book 10 is one of the youngest, so that it would appear that the Ganges still fell within the area of Vedic culture before the codification of the Rigveda.[original research?]