Azumauta, meaning poems from the Togoku region, covers poems handed down in Togoku, which covers the present Kanto region, Tohoku region, and Tokai region, divided into two groups for poems with their place of origin known called kankokuka (90 and 5 poems) and for poems where their place of origin was unknown called mikankokuka (140 and 3 poems).
東歌は東国地方の歌の意で、東国（今の関東・東北地方から東海地方まで含まれる）に伝わる歌を収集し、どの国の歌か判明している歌（勘国歌。90首+5首）と不明の歌（未勘国歌。140首+3首）に二分して収録している。