After the transfer of the administrative function to the inland office 'Dazaifu' (Government Headquarters in Kyushu located at the present Dazaifu City) in 664, one year after the Battle of Hakusukinoe, a facility functioning as a base for overseas exchanges as well as national defense was left near Nanotsu as one of the organizations belonging to the Dazaifu.
白村江の戦いの翌年（664年）に行政機能は内陸の大宰府（現在の太宰府市）に移転、那津のほとりには大宰府の機関のひとつとして海外交流および国防の拠点施設が残された。