Incidentally, around from the tenth century, Waqwaq (الواقواق al-Wāqwāq, 倭国 [Wakoku [Japan]]?) was often referenced in some geography books written in Arabic and Persian languages, including the one written by geographer, Ibn Khurdādh-Bih, as an island (a country) with gold mines, which later evolved into the legend of Zipangu, the land of gold.
なお10世紀頃から地理学者イブン・フルダーズ＝ビフIbnKhurdādh-Bihなどをはじめアラビア語・ペルシア語の地理書において、後のジパングにあたると思われる金山を有する島（国）、ワークワーク（الواقواقal-Wāqwāq,倭国?）について都度都度言及されている。