[370] ἐπί: 'next.'
στόμα Θερμώδοντος: a periphrasis for Θερμώδων as is shown by the masc. participle διαειμένος (372). The Thermodon, whose winding course is described 970 sqq., rises in Pontus and flows, like the Iris, through the plain of Themiscyra, emptying into the Euxine: cf. Aesch. Pr. 751.