Blau (Danube)

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Ulm 27 - Blau.JPG
The Blau in Ulm's historic "Fischerviertel", about 300 m before it flows into the Danube
Country Germany
Location Baden-Württemberg
Physical characteristics
River mouth Danube
48°22′48″N 9°47′10″E / 48.38°N 9.7861°E / 48.38; 9.7861Coordinates: 48°22′48″N 9°47′10″E / 48.38°N 9.7861°E / 48.38; 9.7861
Length 22.2 km (13.8 mi) [1]
Basin features
Progression DanubeBlack Sea
Basin size 499 km2 (193 sq mi) [1]
The course of the Blau from Blaubeuren to Ulm (Postcard by Eugen Felle, ca. 1900)

The Blau (German pronunciation: [ˈblaʊ]) is a 22 km long 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.

Blau valley[edit]

The valley of the Blau was formed by the Danube. When the Swabian Jura rose, the Danube initially incised a deeper and deeper valley but finally chose a course to the southwest. In the valley it left behind today, the Schmiech river flows south meeting the Danube in Ehingen (Donau), whereas the Blau flows east towards Ulm.