Château-Chalon is a commune in the Jura department, Bourgogne-Franche-Comté, eastern France. The commune is perched on a cliff i…Château-Chalon is a commune in the Jura department, Bourgogne-Franche-Comté, eastern France. The commune is perched on a cliff in the first fold of the Jura mountains. It is reached from the west by a road with numerous hairpin curves. Its location has earned its nomination as one of the Most Beautiful Villages of France.