Isarus

ISARUS (Ἴσαρος: the Isar), a river of the Rhaetian Alps, flowing from an Alpine lake, and in a southern direction until it joins the Athesis near Pons Drusi. (Strab. 4. p. 207, where the Ἴσαρος (or a) is said to receive the Atagis (Athesis); either a mistake of Strabo himself, or by a transcriber transposing the names. Comp. ILARUS.)