The jurisdictional area corresponds to the whole area of Nemuro, Kushiro and Chitose Provinces and four counties of Kitami Province (Monbetsu County, Tokoro County, Abashiri County and Shari County), according to ryoseikoku.
管轄地域は令制国に従えば、根室国・釧路国・千島国の全域と北見国の紋別郡・常呂郡・網走郡・斜里郡の4郡に相当する。