Mijoux is a commune and village in the Ain department in eastern France. The village is situated in the upper section of the narrow Valserine va…Mijoux is a commune and village in the Ain department in eastern France. The village is situated in the upper section of the narrow Valserine valley, nestled between high limestone cliffs to the south-east that form the first anticline of the Jura mountains and the edge of the Lajoux plateau to the northwest. However, only the south-eastern side of the valley is within the commune's boundary, which stretches from the source of the Valserine river in the north, to the entry into Lélex, further down the valley, in the south. The commune is roughly 16 km long and 2 km wide.