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Haute Chaine du Jura This nature reserve is situated on the French-Swiss border at the foot of the Dole and the gorge of the Rhone. Its area covers 10 909 ha. The highest peaks of the Jura mountains are: Crêt (1718 m), Reculet (1717 m), Colomby de Gex (1688 m) and the Grand Cret d'Eau (1584 m).