Danube
The Danube was once a long-standing frontier of the Roman Empire, and today flows through 10 countries, more than any other river in the world. Originating in Germany, the Danube flows southeast for , passing through or bordering Austria, Slovakia, Hungary, Croatia, Serbia, Romania, Bulgaria, Moldova and Ukraine before draining into the Black Sea. Its drainage basin extends into nine more countries. The Danube river basin is home to fish species such as pike, zander, huchen, Wels catfish, burbot and tench. It is also home to a large diversity of carp and sturgeon, as well as salmon and trout. A few species of euryhaline fish, such as European seabass, mullet, and eel, inhabit the Danube delta and the lower portion of the river.
Dnieper
In the three countries through which it flows it has essentially the same name, albeit pronounced differently:The river is mentioned both by the Ancient Greek historian Herodotus in the 5th century BC as (), as well as by Strabo; this name is Scythian (cf. Proto-Iranian "Hurú-stáHnam") or local population contemporary with the Herodotus' lifespan and translates as "wide land", referring most likely to the Pontic steppes (Ukrainian steppes). . Unless Icelandic Snorre Skald Sturlasson, in Ynglinga saga, meant Danube, which is rather unlikely, wrote that this river run through Great Sviþjoð (Great Sweden), and separate Asia from Europe (also named Enea, from the eponymous Aeneas). It is, Snorre explains, in his time called Tanais, in earlier times Tanakvisl, and Vanakvisl. This is the realm of the Vanir. To the east is Asia, and the realm of the Æsir. In Snorre Sturlasons perspective ancient peoples that were either later deified, or who practiced deification of their rulers, aka apotheosis.