The bureaucratic administration of Japan is divided into three basic levels; national, prefectural and municipal. Below the national government there are 47 prefectures, six of which are further subdivided into sub-prefectures to better service large geographical areas or remote islands. The municipalities (cities, towns and villages) are the lowest level of government; the twenty most-populated cities outside of Tokyo are known as designated cities and are sub-divided into wards.
The top tier of administrative divisions are the 47 prefectural entities: 43 prefectures (県 ken?) proper, 2 urban prefectures (府 fu?, Osaka, and Kyoto), 1 "circuit" (道 dō?, Hokkaido), and 1 "metropolis" (都 to?, Tokyo). Although different in name they are functionally the same.