What is the name of the moat?

The moat is used for defense, which can prevent the invasion of enemies or animals. It is called the land of Feng Shui. A moat, also known as a city, is defined as an artificially excavated river around the city wall. In ancient times, it was used for defense. In ancient times, it was excavated manually and surrounded the whole city, palaces, temples and other major buildings. It has a defensive function and can prevent the invasion of enemies or animals. This kind of moat, which is dominated by nature and supplemented by man-made, is more in China and even in the world. The most typical cities are Nanjing, Xi, Jingzhou, Xiangyang, Beijing and Baoding. Many countries in the world have dug moats in ancient times, such as China's ancient cities such as Beijing, Ming and Qing Dynasties, Xi 'an, Nanjing, Jingzhou, Jinan (Park around the city), Taiwan Province's Xiangyang, Hsinchu, Zuo Ying, Yizai Jincheng, Japan's Matsumoto, the imperial palace in Edo, and even castles and palaces in European countries. There are moats everywhere Many castles in Europe have wooden bridges, which can be raised on the moat to facilitate access and prevent the enemy from entering.