The drainage water from the Kander Neve (glacier) in the middle of the Bernese Alps at an altitude of flows through the Gasteretal westward. south of Kandersteg it turns to north into the larger Kandertal. After it converges in Frutigen with the Engstlige from the left, its second major tributary. The Engstligental with Adelboden at its south end, runs more or less parallel to the Kandertal before they converge into the Frutigtal. Continuing northwards, the Frutigtal makes a long bend to the west in order to get around the Niesen. Between Spiez and Reutigen it converges with the Simme from the left, its major tributary, and turns to the north again and flows into the Lake of Thun after a break through a hill, which used to prevent it flowing into the lake until 1714. Here the river crosses the A6 motorway.