Passage 6.19.3
Ταρτήσσιον δὲ εἶναι ποταμὸν ἐν χώρᾳ τῇ Ἰβήρων λέγουσι στόμασιν ἐς θάλασσαν κατερχόμενον δυσὶ καὶ ὁμώνυμον αὐτῷ πόλιν ἐν μέσῳ τοῦ ποταμοῦ τῶν ἐκβολῶν κειμένην· τὸν δὲ ποταμὸν μέγιστόν τε ὄντα τῶν ἐν Ἰβηρίᾳ καὶ ἄμπωτιν παρεχόμενον Βαῖτιν ὠνόμασαν οἱ ὕστερον, εἰσὶ δʼ οἳ Καρπίαν Ἰβήρων πόλιν καλεῖσθαι νομίζουσι τὰ ἀρχαιότερα Ταρτησσόν.
They say that Tartessus is a river in the land of the Iberians, flowing into the sea through two mouths, and a city bearing the same name is situated between these mouths of the river. Later generations called this river—being both the largest in Iberia and tidal—the Baetis. There are some who believe that Carpía, an Iberian city, was known in earlier times as Tartessus.