Sandao "三嶋" in Chinese characters, which was also known as Sanyu (三嶼) or Sanshu (三洲), were a collection of a Prehispanic Filipino polities recorded in Chinese annals as a nation occupying the islands of Jamayan 加麻延 (present-day Calamian), Balaoyou 巴姥酉 (present-day Palawan),Yang Bowen, Zhufan zhi jiaoshi (Beijing, 1996), p. 145 and Pulihuan 蒲裏喚 (near present-day Manila).Hugh R. Clark, Community, trade, and networks, Southern Fujian province from the third to the thirteenth century (Cambridge: Cambridge University Press, 1991), pp. 127‒132. In the Chinese Gazetteer the Zhufan zhi 諸蕃志 (1225), they were described as tributary states of the more powerful nation of Ma-i centered in nearby Mindoro.A Chinese Gazetteer of Foreign Lands A new translation of Part 1 of the Zhufan zhi 諸蕃志 (1225) By Shao-yun Yang (Department of History, Denison University)
