Blau (Danube)

The Blau (German pronunciation: [blaʊ]) is a 22-kilometre-long (14 mi) river in Baden-Württemberg, southern Germany, and a left tributary of the Danube. The source of the Blau is the karst spring of Blautopf, in the town Blaubeuren, in the Swabian Jura. It flows east through Blaustein to the city of Ulm, where it empties into the Danube.

Flows through: Germany.

River data from Wikidata (CC0); lengths normalised to a common unit.