The list of han or domains in the Tokugawa period (1603–1868) changed from time to time during the Edo period. Han were feudal domains that formed the effective basis of administration in Tokugawa-era Japan. The Han are given according to their domain seat/castle town by modern region (-chihō, roughly comparable to ancient circuits, -dō) and ancient province (kuni/-shū, roughly comparable to modern prefectures, -to/-dō/-fu/-ken). Han usually comprised territories around/near the capital, but were beyond that in many cases disconnected and distributed over several provinces.