France is mainly divided into 18 administrative regions: 13 regions in metropolitan France (including the territorial collectivity of Corsica), and five located overseas. The regions are further subdivided into 101 departments, which are numbered mainly alphabetically. This number is used in postal codes and was formerly used on vehicle number plates. Among the 101 departments of France, five (French Guiana, Guadeloupe, Martinique, Mayotte, and Réunion) are in overseas regions (ROMs) that are also simultaneously overseas departments (DOMs), enjoy exactly the same status as metropolitan departments and are an integral part of the European Union. The 101 departments are subdivided into 335
Dong (administrative division) places, it can be divided into several administrative neighborhoods. Sillim-dong is a typical example for this case. For the same reason, there are some inverse cases, i.e. a single administrative neighborhood holding multiple legal-status neighborhoods. Such cases contain undeveloped suburban area, or recently declining area. The primary division of a "dong" is the "tong" (통/), but divisions at this level and below are used rarely in daily life. Cases using "tong" contain school districts or military services. Some "dong" are subdivided into "ga" (가/), which are not a separate level of government but only exist for use in addresses. Many