It is a leading theory that it was on the right bank of the Seta-gawa River flowing from the Lake Biwa, stood around the Ishiyama Kokubu site in Otsu City, Shiga Prefecture.
琵琶湖から流れ出す瀬田川右岸に位置し、滋賀県大津市の石山国分遺跡の周辺に比肩する説が有力。