Ἰνδικά 22.3: Euseb. Pr. Ev. IX, p. 456, D

22.3

Εὗρον δὲ καὶ ἐν τῇ Ἀβυδηνοῦ Περὶ Ἀσσυρίων γραφῇ περὶ τοῦ Ναβουχοδονόσορ ταῦτα·» Μεγασθένης δέ φησι Ναβουκοδορόσορον Ἡρακλέος ἀλκιμώτερον γεγονότα ἐπί τε Λιβύην καὶ Ἰβηρίην στρατεῦσαι· ταύτας δὲ χειρωσάμενον ἀποδασμὸν αὐτέων εἰς τὰ δεξιὰ τοῦ Πόντου κατοικίσαι. (Quae sequuntur non sunt Megasthenis, sed Abydeni).

There is in India a river called the Silas, named after the fountain from which it flows, on which nothing will float that is thrown into it, but everything sinks to the bottom, contrary to the usual law.