The southeastern foothill forms a relatively slow slope and there are castle walls along the three dales leading to the sea (that are referred to as 'First Castle Door,' 'Second Castle Door' and 'Third Castle Door,' respectively) that still remain in existence today.
南東麓は比較的緩やかな斜面で、海に通じる三本の谷（北から順に「一の城戸」「二の城戸」「三の城戸」）には城壁が残っている。