In some case of enumerating all province names such as 'the list of Ichinomiya shrine throughout the nation', two provinces forcedly reduced to 66 due to the incompliance with the acutual number of the province by integrating, for example, Bizen, Bicchu and Bingo into Kibi province(but Mimasaka province which was separated from Bizen province, was not integrated).
「全国一宮一覧」など全ての国を列挙するような場合には、実際の国の数と合わないので、備前・備中・備後をまとめて吉備とする（ただし、備前から分かれた美作はそのまま）など無理に2国減らして66にすることも行われた。