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The municipality is located at the confluence of the Önz into the Aare river a nature reserve.
(Thielle Channel); correction of the Aare river as from Büren to the city of Luterbach, including the junction of Emme River.
This dam ensures the level control of the three lakes of Neuchâtel, Morat and Bienne, an area so called the "Seeland”,as well as the outflow of the Aare river downstream toward Solothurn, Aargau and the junction with Emme River down to the merging with the Rhine River.
The Paul Scherrer Institute is primarily located in Villigen, although part is across the Aare river in Würenlingen.