Harry Thurston Peck, Harpers Dictionary of Classical Antiquities (1898)

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Eridănus

（Ἠρίδανος). A river-god, on the banks of whose river amber was found (Hesiod, Theog. 338). In later times the Eridanus was supposed to be the same as the Padus (Po), because amber was found at its mouth. Hence the Electrides Insulae, or “Amber Islands,” are placed at the mouth of the Po, and here Phaëthon was supposed to have fallen when struck by the lightning of Zeus.