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

In 1606 (the 34th year of the reign of Emperor Wanli of the Ming Dynasty), Xia Ziyang, an imperial title-conferring envoy from the Ming court, was sent to Ryukyu. He wrote in his Records of the Imperial Title-Conferring Envoys to Ryukyu (Shi Liu Qiu Lu): “In the afternoon, we passed Diaoyu Yu. The next day, we arrived at Huangwei Yu. That night, the wind roared, making the waves surge over the helm…when the water flows from Hei Shui back to Cang Shui, it enters Chinese territory.”