The Danube is conventionally taken to be formed by the confluence of the two streams Brigach and Breg just east of Donaueschingen. The source of the Donaubach, which flows into the Danube, in Donaueschingen is often referred to as the source of the Danube (Donauquelle). Hydrologically, the source of the Danube is the source of the Breg as the larger of the two formative streams (with its spring at a higher altitude and - at the confluence - not only being 5 km longer but also having a higher amount of water discharge) which rises near Furtwangen.