Mantes-la-Jolie (French pronunciation: [mɑ̃t.la.ʒɔ.li], often informally called Mantes) is a commune based in the Yvelines department in the Île-de-France region in north-central France. It is located in the western suburbs of Paris, 48.4 km (30.1 mi) from the center of Paris. Mantes-la-Jolie is a sub-prefecture department.