La Chaux-de-Fonds is a Swiss city in the canton of Neuchâtel. It is located in the Jura mountains at an altitude of 1000 m, a few kilometres south of the French border. After Geneva, Lausanne and Fribourg it is the fifth largest city in the Romandie, the French-speaking part of the country, with a population of.[https://www.romanvie.ch/canton-de-vaud/plus-grande-ville-suisse-romande.htm]