The Suhre flows from the Sempachersee in Oberkirch (LU) north of the lake just next to medieval town of Sursee, which it traverses afterwards.

After the underpass of the A2 motorway the creek Ron from the Mauesee joins the Suhre in the Sursiwald from the west (forest; left, Sursee).

Ruederchen is a larger creek which forms the Ruedertal, which in itself divides from north-west to south-east the north–south mountain range between the Suhretal and the Wynetal in the east.

Holziken is at the northern bottom end of the eastern mountain range of the upper two-thirds of Suhre Valley.

About after 2 km it runs through the middle of Suhr, turns again to the north, being joined by the Wyna from the right just before Buchs (AG).