The Paris agglomeration's urban sociology is basically that of 19th-century Paris: its fortuned classes are situated in its west and southwest, and its middle-to-lower classes are in its north and east. The remaining areas are mostly middle-class citizenry dotted with islands of fortuned populations located there due to reasons of historical importance, namely Saint-Maur-des-Fossés to the east and Enghien-les-Bains to the north of Paris.