A. Beishan City, located in the north of Okinawa Prefecture. In November 2000, the Ryukyu Kingdom was listed as a World Heritage Site. In the 14th century, the Ryukyu Kingdom was still in the era of the three kingdoms. It was the city residence of the King of Beishan. From the various unearthed pottery, you can see the prosperity of the past. Later, the king of Beishan was destroyed by the king of Zhongshan, and the king of Zhongshan set up a supervision center there, and from now on, the city of Rencheng has become a supervised city residence.