The Sandbach is a river in the counties of Rastatt and Baden-Baden in the German state of Baden-Württemberg. From its source it runs, initially as the Bühlot, northwestwards within the Northern Black Forest, then out onto the Upper Rhine Plain heading north-northeast at first before swinging northwest again to its confluence. Its mouth lies 29.1 kilometres below its source near Iffezheim, where it discharges from the right into the lower reaches of the Acher which are known as the Altrheinzug .
The source region of the Sandbach lies near the Black Forest High Road between Hundseck and Unterstmatt on the Hochkopf at a height of about 855 m above sea level .
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