A subprefecture is an administrative division of a country that is below prefecture or province.

What do you mean Prefecture?

1 : the office or term of office of a prefect. 2 : the official residence of a prefect. 3 : the district governed by a prefect.

How many Subprefectures does Japan have?

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 subprefectures to better service large geographical areas or remote islands.