Erannaoboas is the ancient name of the river Sone. The ancient city of Palibothra stood at the confluence of the Ganges and Erannoboas. It is said that the capital of Chandragupta, Pataliputra, was the same as the Palibothra of Sandracottus, the modern Patna. But exception was taken on the ground that Patna was not situated near the confluence of the Ganges and Sone, or Erannoboas, where Palibothra stood. This, however, has been explained by a change in the bed of the river Sone, which is established on geographical evidences.
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