The theory explaining that the area inside the lines connecting all of the points where the respective Goshiki Fudo were located on the map was referred to as 'Shubikiuchi' or 'Naifu of Edo' is contradictory to the fact.
なお、五色不動を結んだ線の内側が「朱引内」あるいは「江戸の内府」と呼ばれたという説は事実ではない。