Ninomaru is divided into eastern and western sections by the Shikiri-mon Gates on the north and south sides of Honmaru (some documents refer to the western section as "Nishinomaru").
二の丸は本丸の北と南にある仕切門によって東西に分かれている（この西側部分を「西の丸」と呼ぶ資料もある）。