Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Vallée de Joux is a valley of the Jura Mountains in the swiss Canton of Vaud. It is located at 20 miles (50 km) North from Geneva and Lausanne, its mean altitude is over 3300 feet (1000 meters). 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 all along the north part of the valley.