The Kander River is a tributary of the Aar River. It is 44 km long and has a watershed of 1,126 kmē. It flows into Lake Thun (only since 1714).
With respect to rafting, the Kander is classified as unrunnable (level VI on the International Scale of River Difficulty) due to the river's numerous rapids and barriers. In 2008, a Swiss Army rafting party's inflatable boats capsized during an attempt to navigate the river; five soldiers were killed.