Mutsu Province was the northernmost of 66 provinces in Japan (though it was thought to be the easternmost in those days), and was the remote region along with Dewa Province as well as the large country with vast territory.
陸奥国は66ヶ国中、日本の北限にあたり（当時は東限と認識されていた）、出羽国と並ぶ辺境の国であると同時に、広大な領域を有する大国でもあった。