The Kander is a river in Switzerland . It is 44 kilometres (27 mi) long and has a watershed of 1,126 square kilometres (435 sq mi). Originally a tributary of the Aare , with a confluence downstream of the city of Thun, since 1714 it flows into Lake Thun upstream of the city.

The drainage water from the Kander Neve (glacier) in the middle of the Bernese Alps at an altitude of 2,301 m (7,549 ft) flows through the Gastern Valley westward. 3 kilometres (1.9 mi) south of Kandersteg it turns to north into the larger Kandertal. After 14 kilometres (8.7 mi) it converges in Frutigen with the Engstlige from the left, its second major tributary.