Although many were constructed in Honmaru as Tenshu were, some were constructed in Ninomaru (outer citadel) as Gosankai Yagura in Tokushima-jo Castle and Mito-jo Castle were.
天守と同様に本丸に建てられることが多かったが、徳島城や水戸城の御三階櫓のように二の丸に造られることもあった。