Prabhasa, Shiva was fire. The tirtha where the Sarasvati met the sea in Prabhasa was once
Mahishmat, the father of
Sahasrarjuna of the Puranic tradition, wrested an ancient port near Broach on the Narmada
from the Nagas in order to found Mabishmati.
Two facts emerge from these references. First, the Nagas
were associated with the region from the mouth of the river Indus to the mouth of
the Narmada and perhaps further south. Secondly, Prabhasa was associated with the Nagas
referred to as belonging to Patala.
Thirdly, the Linga of Somanatha, before the earliest period
of Aryan tradition, was a divinity connected with Patala and the Nagas.