The relationships between provinces and prefectures are varied depending on which areas they are located; there are prefectures which straddle plural provinces (Shizuoka Prefecture, Mie Prefecture, Hyogo Prefecture, and so on) as well as provinces that straddle plural prefectures (Musashi Province, Tanba Provinces, Bizen Provinces, and so on).
国と県の関係は地域により様々で、複数の国にまたがる県（静岡県・三重県・兵庫県など）と、複数の県にまたがる国（武蔵国・丹波国・肥前国など）の両方がある。