Apt

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Apt (French pronunciation: ​[apt]; Provençal Occitan: At / Ate in both classical and Mistralian norms) is a commune in the Vaucluse department in the Provence-Alpes-Côte d'Azur region in southeastern France. It lies on the left bank of the Calavon, 41 miles (66 km) east of Avignon. It is the principal town of the Luberon mountains. The town has notoriety for defining the Aptian age of the Early Cretaceous.