The 152-kilometre (94 mi) long river flows begins in the Sirdalsheiane mountains near the borders of Agder and Rogaland counties.

The headwaters of the river is the lake Ytre Storevatnet and it flows south through the Sirdalen valley in the municipalities of Sirdal and Flekkefjord.

The river flows through the large lakes Sirdalsvatnet and Lundevatnet before heading south on the Agder/Rogaland county border.

The river runs through several large villages such as Åna-Sira, Sira, Tonstad, Lunde, and Kvæven.

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