Bonvillars is a municipality in the district of Jura-Nord Vaudois in the canton of Vaud in Switzerland.

Lake Neuchâtel is a lake primarily in Romandy, the French-speaking part of Switzerland. The lake lies mainly in the canton of Neuchâtel, but is also shared by the cantons of Vaud, Fribourg, and Bern. It comprises one of the lakes in the Three Lakes Region, along with lakes Biel/Bienne and Morat/Murten.