Danube once appears as the mother of Vrtra, "a dragon blocking the course of the rivers." The Finnish word for Danube is Tonava, which is most likely derived from the word for the river in Swedish and German, "Donau". Its Sámi name "Deatnu" means "Great River". It is possible that "dānu" in Scythian as in Avestan was a generic word for "river": "Dnieper" and "Dniestr", from "Danapris" and "Danastius", are presumed to continue Scythian "*dānu apara" "far river" and "*dānu nazdya-" "near river", respectively. The river was known to the ancient Greeks as the "Istros" (Ἴστρος) a borrowing from a Daco-Thracian
Danube–Tisa–Danube Canal Danube–Tisa–Danube Canal Danube–Tisa–Danube Canal (DTD) () is a canal system in Serbia. It is a unique hydro-engineering system for flood control and hydrotechnical management, amelioration, forestry, water supply, waste water evacuation, navigation, tourism, fishing, hunting. It was named after the two large rivers which it connects – the Danube and the Tisa. There are several other names used for the canal in other languages: ; , etc. It covers the northern part of Serbia – the territory of Vojvodina (Bačka and Banat regions), with the total area of about 12,700 km². It consists of a number of canals, including: The