The Achaei were an ancient people of Scythia, mentioned by Strabo (11.2, together with the Zygoi, Heniochi, and Cercetae and Macropogones) and by Pliny (4.26.2). Pliny mentions a Portus Achaeorum at the mouths of the Danube. The name has been interpreted to mean "river dwellers", from an Indo-European word for "water" (Latin aqua, Old High German aha; Wissowa, Pauly's Real-Encyclopadie s. v. Achaei) To meet Wikipedias quality standards, this article or section may require cleanup. ... The Greek geographer Strabo in a 16th century engraving. ... The Danube (ancient Danuvius, ancient Greek Istros) is the longest river of the European Union and Europes second-longest[3] (after the Volga). ...