At its southern end, the Sims flows out of the Simssee to the north of Riedering at 470 m above sea level and immediately heads west through the wet Achalterwiesen meadows in the nature reserve on the southern shore of the Simssee . Here it picks up a second short outflow of the lake from the right, runs a good distance through the nature reserve and then touches the district of Eitzing on its southern edge at the Krottenhausmühle. Further downstream, it runs through the Kohlhauf and Pulvermühle sites before entering the forest area around the Lauterbacher Filze, where it picks up the Röthbach flowing in from Riedering-Niedermoosen in the south and then loops around another Stephanskirchen Pulvermühle. In the adjoining Röthbachholz, its longest mill channel branches off to the right to Landlmühle, which it then picks up again after crossing under the railroad line from Rohrdorf to Landl in the industrial area south of Landl. After the small river has also crossed under the Miesbacher Straße (St 2095) and passed through Murnau, it joins the Rohrdorfer Achen, which runs parallel to the Inn, on its western edge to the wedge-shaped alluvial forest along the Inn, and which joins the Inn from the right just 300 meters further on.
From Lake Simssee, from the upper end of the lake in the northeast to the southwest to the outlet of the Sims:
- Antworter Achen, from the east in the Lakemoss near Söchtenau-Eichen on the Simssee
- Thalkirchner Achen, from the south in the Lakemoss near Bad Endorf-Thalkirchen
- Labenbach, from the southeast near Riedering-Moosen
- Fellbach, from the southeast near Riedering-Pietzing
- Angerbach, Bavaria, from the southeast near Riedering-Beuerberg
From the ledge at the origin of the lake to the mouth:
- New Achen, from the right and northeast from the Simssee. Short different process
- Schlierbach, from the left and southeast north of Riedering
- Rothbach, from the left and south north of Riedering
- Large Filsgraben, from the right and north
- Kleines Wasser, from the left and southeast at the Kohlhaufmühle into left branch there
- Röthbach, from the left and south west of Riedering
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