Rigvedic Rivers and Reference of Samudra
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 some of the early books of the Rigveda, 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 Brahmanas and 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 Afghan river Haraxvaiti/Harauvati Helmand is sometimes quoted as the locus of the early Rigvedic river. Whether such a transfer of the name has taken place from the Helmand to the Ghaggar-Hakra is a matter of dispute. Identification of the early Rigvedic Sarasvati with the Ghaggar-Hakra before its assumed drying up early in the second millennium would place the Rigveda BC, 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 South Asia are Indo-Aryan. Non-Indo-Aryan names are, however, frequent in the Ghaggar and Kabul River areas, the first being a post-Harappan stronghold of Indus populations.