Danube
"Danube" is an Old European river name derived from a Proto-Indo-European "*dānu". Other river names from the same root include the Dunaj, Dzvina/Daugava, Don, Donets, Dnieper, Dniestr, Dysna, Tana and Tuoni. In Rigvedic Sanskrit, "dānu" means "fluid, drop", in Avestan, the same word means "river". In the Rigveda, "Dānu" 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.
Tsibritsa
The Tsibritsa (, pronounced ; also transliterated as "Cibrica", "Tzibritza"; ) is a river in the western Danubian Plain of northern Bulgaria and a right tributary of the Danube. The river originates in the Shiroka Planina ("Wide Mountain") area of the Fore-Balkan Mountains near the Serbian border and flows in a northeast direction diagonally through Montana Province. East of the village of Dolni Tsibar in Valchedram municipality, it flows into the Danube.