The Vallée de Joux is a valley of the Jura Mountains in the Swiss Canton of Vaud. Located 20 miles (50 km) north of Geneva and Lausanne, its mean elevation is over 3300 feet (1000 metres). There are three lakes in the Vallée de Joux : the lac de Joux (around 6 miles (10 km) long), the lac Brenet and the lac Ter. The border with France is along the northern part of the valley.
There are three main municipalities in the valley, Le Chenit, Le Lieu and L'Abbaye forming the district of La Vallée. These include ten villages, such as Le Sentier, Le Brassus and Le Pont.
The Vallée de Joux is, along with Neuchâtel, the birthplace of Swiss horology and it is still the home of the most famous Swiss watch factories, like Audemars Piguet, Blancpain, Patek Philippe & Co., Vacheron Constantin, and Jaeger-LeCoultre.