ATHESIS, in Ancient Geography, a river of the Cisalpine Gaul, which, rising in the Rhetian Alps, in Mount Brenna, in the county of Tirol, runs southwards and washes Tridentum and Verona, which last it divides; and after passing this, bends its course eastwards, in a parallel direction with the Po, and falls into the Adriatic between Fossa Claudia and Philisina: it separated the Euganei, an ancient people, from the Veneti. The people dwelling on it are called Athefini (Pliny). Its modern name is the Adige.