It measures 43 meters from east to west, 50 meters from north to south, surrounded by Dorui and there are stone walls inside and outside of the Dorui at its east, west, and south.
大きさは、東西43m×南北50mの規模があり、周囲には土塁、東西、南側には土塁の内、外側に石垣を築いている。