Introduction to the Zhuhai Ming and Qing Coastal Defense Historical Relics Exhibition: Zhuhai is located on the west bank of the Pearl River Estuary, on the coast of the South China Sea, adjacent to Hong Kong and Macao, with a total land and sea area of ​​7,649 square kilometers, and 146 islands of various sizes distributed in the vast sea area. It has always been an important frontier for border defense. A strategic place for military strategists. In the early Ming Dynasty, in order to prevent harassment by bandits, protective fences were set up at Jinding Seaside and forts were built at Yingbiao Mountain on Sanzao Island. In the mid-Ming Dynasty, a policy of seclusion was implemented.