`Volume 81, Liezhuan the
forty sixth Dong Yi Wakoku' of "Suishu" (the Book of the Sui Dynasty) states that the
country of Hiizurutokoronotenshi, the
king of Wakoku, was
in Santo (literally, mountain,
island) and that Mt. Aso was
located in Wakoku, which
means that Wakoku is Kyushu.