Western tributaries of the Gudbrandsdalslågen include the Gausa River flowing through the Gausdal valley, the Otta River flowing through the Ottadalen valley, the Vinstra River flowing through the Vinstradal valley, and the Sjoa River, flowing through the Heidal valley.
Sigvat jumped across the river Sjoa at this narrow point in the canyon, with a beautiful girl from Vågå.
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Perhaps the most easy definition is to state that the valley draining Sjoa is named Sjodalen in Vågå and Heidal in Sel municipalities.