San Diego (/ˌsæn diˈeɪɡoʊ/ SAN dee-AY-goh, Spanish: [san ˈdjeɣo]; Spanish for 'Saint Didacus') is a city on the Pacific Ocean coast of Southern California located immediately adjacent to the Mexico–United States border. With a 2020 population of 1,386,932, it is the eighth most populous city in the United States and the seat of San Diego County, the fifth most populous county in the United States, with 3,338,330 estimated residents as of 2019. The city is known for its mild year-round climate, natural deep-water harbor, extensive beaches and parks, long association with the United States Navy, and recent emergence as a healthcare and biotechnology development center. San Diego is the second largest city in the state of California, after Los Angeles.
Heyuan, also known as "Croucher City", is a prefecture-level city in Guangdong Province, located in the northeast of Guangdong Province, the middle and upper reaches of Dongjiang River, Meizhou City and Shanwei City in the east, Huizhou City in the south, Shaoguan City in the west, and Ganzhou City in Jiangxi Province in the north, with a total area of 15642 square kilometers. It has jurisdiction over five counties in one district, namely, Longchuan County, Dongyuan County, Heping County, Zijin County and Lianping County. By the end of 2018, there are 3.0939 million permanent residents. Heyuan City has Wanlu Lake, the largest lake in South China, and the highest fountain in Asia. It is one of the top 10 green economy cities in China, the most potential financial ecological city, and the top ten characteristics of China.