“Inner citadel” in Japanese
Short answer
Inner citadel in Japanese is “本丸” (honmaru). Full meaning: inner citadel; core, center, centre, focus, crux.
Other ways to say “Inner citadel” in Japanese
本拠
honkyo stronghold, inner citadel, base, headquarters
牙城
gajou stronghold (esp. of an enemy or opponent), inner citadel, bastion
本拠地
honkyochi stronghold, inner citadel, base, headquarters
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