It is a right tributary of the Freiberger Mulde with a length of about 38 km (24 mi).

[3] The source of the river is located about 5 km (3.1 mi) south-east of Frauenstein in the Eastern Ore Mountains, above Hartmannsdorf-Reichenau on the edge of Kreuzwald forest and 600 m (2,000 ft) from Weicheltmühle (a watermill) on Gimmlitz river.

The river passes through Reichenau, Kleinbobritzsch, Hartmannsdorf, Friedersdorf, Oberbobritzsch and Niederbobritzsch, Naundorf, Falkenberg, Krummenhennersdorf, Reinsberg and Bieberstein.

A well-known hiking path along Bobritzsch river between Krummenhennersdorf and Reinsberg is called Grabentour.

Bobritzsch river joins Freiberger Mulde between Reinsberg and Siebenlehn, 1 km (0.62 mi) north of Bieberstein castle.