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| Ach | |
|---|---|
 | |
  Mouth of Ach | |
| Location | |
| Country | Germany |
| State | Baden-Württemberg |
| Physical characteristics | |
| Mouth | |
• location | Blau |
• coordinates | 48°24′57″N9°47′10″E / 48.41583°N 9.78611°E /48.41583; 9.78611 |
| Length | 10.2 km (6.3 mi)[1] |
| Basin features | |
| Progression | Blau→Danube→Black Sea |
TheAch, also calledAach, is ariver located inBaden-Württemberg,Germany. It flows into theBlau inBlaubeuren.
The river Ach has its source west ofSchelklingen in the Achursprung (535 m above sea level), a karst spring at the Dreikönigsmühle and about 500 m south of the monastery Urspring. It is a circular, bluish shimmering spring pot with an average flow of 440 litres per second (min. 110 L/s, max. 1,200 L/s).
After only about 100 m of river, the longer and more water-richUrspring, which has its source near the monastery Urspring, flows into the river on the left side. The Ach runs along its entire length in a valley of theUrdonau. Until Schelklingen it flows in an easterly direction, but then turns to the northeast. Before its mouth, the Ach flows around the Bruckfels near Weiler at the Geißenklösterle and the Weilerhalde in two wide river loops before it flows throughBlaubeuren and joins the still young Blau at 515 m above sea level.
On its 10.2 km long path the Ach falls 20 m in height, which corresponds to a mean bed gradient of 2 ‰
Auf ihrem 10,2 km langen Weg fällt die Ach um 20 m Höhe, was einem mittleren Sohlgefälle von 2 ‰ entspricht.
In Schelklingen are the ruins ofHohenschelklingen Castle andSaint Afra's Chapel with itsGothicfresco cycle. In the Ach valley are theHohler Fels, one of the largest caverns in theSwabian Jura and south Germany, in whicharchaeologically important discoveries were made. On the opposite side of the valley stands the Sirgenstein, a twenty-metre-high rock outcrop on which there are traces of aStone Age cave dwelling and amedieval castle. Further down the valley are the ruins ofGünzelburg Castle and another Stone Age cave,Geißenklösterle, and yet another Stone Age cave,Brillenhöhle Cave. In Blaubeuren are theBlautopf and, nearby, the formerBlaubeuren Abbey with its abbey church, the ruins of theRusenschloß and thehammer mill.
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