Thun is a town and municipality situated in the administrative district of Thun within the canton of Bern in Switzerland. It is geographically positioned at the point where the Aare river flows out of Lake Thun, also known as Thunersee.
The town is located approximately 30 kilometres southeast of the city of Bern. It serves as a primary location for the surrounding administrative district and sits at a key waterway junction in the region.