Kokuga is a term for describing the section in which a government office, a Kokushi (provincial governor) executed the local government functions of the ritsuryo system (a system of centralized government based on the ritsuryo code) in Japan, used to be located.
国衙（こくが）は、日本の律令制において国司が地方政治を遂行した役所が置かれていた区画を指す用語。