"The story that the Argonauts returned home by means of the Istros (Danube) and the Adriatic (see 1.2.10) meant that there were also relics in those areas, some of which were mentioned by Kallimachos. He placed the Argonauts in the Aegean (Anaphe, an island east of Thera where they landed [Apollonios 4.1717]), Thessaly (called Haimonia), and on the Istrian (Histrian) peninsula, where the pursuing Kolchians founded Pola (modern Pula in Croatia). Such a return for the Argo is based on the idea that the Istros split into two branches, one to the Black Sea and the other to the Adriatic, a geographical improbability first mentioned in the fourth century BC (Pseudo-Skylax 20; Aristotle, Research on Animals 7[8].13). The idea may have come through erroneous understanding of the complex river systems of the region, the fact that tributaries of the Danube are within 20 km. of the Adriatic in Croatia, and the similarity of the names Istros (the river) and Histria (the peninsula)"--