What is "sjodalen"

Sjodalen is a wide, gently sloping valley in Southern Norway, draining the eastern parts of Jotunheimen. The river Sjoa gives its name to the valley. Sjodalen is generally accepted to start at the outlet from the deep mountain-lake Gjende. The valley's lower end-point is, however less defined as the valley is named Heidal east of Randsverk. Perhaps the most easy definition is to state that the valley draining Sjoa is named Sjodalen in Vågå and Heidal in Sel municipalities.