The geography of the Rigveda seems to be centered around the land of the seven rivers. While the geography of the Rigvedic rivers is unclear in the early mandalas, the Nadistuti hymn is an important source for the geography of late Rigvedic society.
The Sarasvati River is one of the chief Rigvedic rivers. The Nadistuti hymn in the Rigveda mentions the Sarasvati between the Yamuna in the east and the Sutlej in the west, and later texts like the Mahabharata mention that the Sarasvati dried up in a desert.
Most scholars agree that at least some of the references to the Sarasvati in the Rigveda refer to the Ghaggar-Hakra River, while the Helmand is often quoted as the locus of the early Rigvedic river. Whether such a transfer of the name has taken place, either from the Helmand to the Ghaggar-Hakra, or conversely from the Ghaggar-Hakra to the Helmand, is a matter of dispute. Identification of the early Rigvedic Sarasvati with the Ghaggar-Hakra before its drying up would place the Rigveda well before 1700 BC, and thus well outside the range commonly assumed by Indo-Aryan migration theory.
A non-Indo-Aryan substratum in the river-names and place-names of the Rigvedic homeland would support an external origin of the Indo-Aryans. However most place-names in the Rigveda and the vast majority of the river-names in the north-west of India are Indo-Aryan (Bryant 2001).
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