The fifth theory is that Kokai, the plain of later the Yamato basin and the vicinity of Mt. Miwa were named Ashiharamizuho no kuni, and present-day around Kashihara was named Ashiwara no nakatsukuni or 葦原中国 in Japanese.
広海、後の大和盆地の平野部、三輪山近辺を葦原瑞穂国と定め、現在の橿原あたりを葦原中国（あしわらのなかつくに）としたという解釈。