Talageri (2000), based on his proposition of an westward expansion early Rigvedic culture from Harayana (contrary to the nearly universally assumed eastward expansion from Gandhari) and his identification of some Rigvedic rivers, claims this Mandala as the oldest of the family books.
The rivers mentioned in the 7th Mandala are the Sarasvati, Asikni, Parusni and possibly the Yamuna (in 7.18.19 the name of a helper of Indra, maybe also the name of a woman or goddess).
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Rivers play an important role, deified as goddesses, most prominently the Sapta Sindhu and the Sarasvati River.