Zhongshan City, known as Xiangshan in ancient times, is a prefecture-level city under the jurisdiction of Guangdong Province, one of the central cities of the Pearl River Delta, an important node city in the Guangdong-Hong Kong-Macao Greater Bay Area, one of the regional centers of Guangdong, one of the cities in the metropolitan area on the west bank of the Pearl River Estuary, and a national type-II large city. The city is located between latitude 22°11′-22°47′N and longitude 113°09′-113°46′E, and is situated in the middle south of the Pearl River Delta where the Xijiang River and the lower reaches of the Beijiang River come out of the sea; it is one of the four prefectural-level cities in the country that do not set up a district, with a total area of 1,783.67 square kilometers, 8 streets and 15 towns under the jurisdiction of the city as of September 2022, and a total area of 1,783.67 square kilometers. streets and 15 towns. As of the end of 2022, Zhongshan City had a resident population of 4,431,100 people. In ancient times, Xiangshan was an island suspended in the Lingding Sea at the mouth of the Pearl River, with the present-day Wugui Mountain and Fenghuang Mountain (now Zhuhai City) and the surrounding mountains and hills, i.e., the land from Shiqi to Macao. Formerly known as Xiangshan County of Guangzhou Prefecture, established in 1152 and renamed Zhongshan County in 1925 in honor of Dr. Sun Yat-sen, the city was upgraded in January 1988 to a prefecture-level city. Zhongshan is the hometown of Dr. Sun Yat-sen; it is a national historical and cultural city, and the Xiangshan culture originated in Zhongshan is an important source of modern Chinese culture; Zhongshan is also one of the representative cities of Guangfu culture and one of the birthplaces of Guangfu cuisine; it enjoys the reputation as the hometown of Cantonese opera and the hometown of overseas Chinese in Guangdong Province. There are more than 800,000 overseas Chinese, Hong Kong, Macao and Taiwan compatriots residing in 87 countries and regions on five continents. In 2023, the gross regional product of Zhongshan City was 385.065 billion yuan, an increase of 5.6% year-on-year. Among them, the added value of the primary industry was 9.413 billion yuan, an increase of 5.5% year-on-year; the added value of the secondary industry was 196.592 billion yuan, an increase of 7.3% year-on-year; and the added value of the tertiary industry was 179.059 billion yuan, an increase of 3.7% year-on-year.