Although not being located in such a high place, the Honmaru is supposed to have had a high military value because spring water was available even at the height of 7 go-me (70% of the height of the mountain)
それほど高所に位置するわけではないが、湧水が7合目付近でも得られることから、戦略上の価値はきわめて高かったと推定される。