Records of the Imperial Title-Conferring Envoys to Ryukyu (Shi Liu Qiu Lu)

In 1579 (the 7th year of the reign of Emperor Wanli of the Ming Dynasty), Xiao Chongye, an imperial title-conferring envoy from the Ming court to Ryukyu and Xie Jie, Xiao’s deputy, also recorded in Records of the Imperial Title-Conferring Envoys to Ryukyu (Shi Liu Qiu Lu), “It took us 30 days to arrive at Huangmao Islet. And on the first day of lunar May, we passed Diaoyu Yu and two days later, we arrived at Chi Yu, which sits at the border between China and Ryukyu. The next day, we saw Kume Mountain.” This passage also shows that Chi Yu is the border between China and Ryukyu.