Chillon Castle (French: Château de Chillon) is a medieval island castle in Switzerland, located on the Swiss Riviera, at the edge of Lake Geneva, 3 km from the city of Montreux, between the settlements of Veytaux and Villeneuve.

Lake Geneva is 60% in Switzerland and 40% in France. Its crescent shape sweeps through the cantons of Vaud, Geneva, and Valais, passing some of the best attractions in Switzerland. The 582 km2 body of water is the focal point of the area. The uniquely mild climate makes it a popular destination for outdoor activities in Switzerland.