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.
Chaling County, which belongs to Zhuzhou City, is located in the east of Hunan Province. It extends to Changsha in the north, Guangzhou in the south, Hengyang in the west and Jiangxi in the east, covering an area of 2500 square kilometers (2013). It is located between longitude 113 °20 "113 °65" east and latitude 26 °30 "27 °7 'north. It belongs to the humid climate of subtropical monsoon. Chaling County is the only administrative county named after tea in Chinese history. Because it is located in the "shadow of the tea mountain", and the first ancestor of the Chinese nation, Yan Emperor Shennong, was buried at the end of the tea village. Because of the Southern Song Dynasty county magistrate Liu Zimai cast iron rhinoceros town river demon and has the reputation of "rhinoceros city". Chaling County is one of the six counties in the Jinggangshan revolutionary base area, and the key counties and model counties in the Hunan-Jiangxi revolutionary base area are the first red political power in China created by Mao Zedong. In August 2018, Hunan Provincial Government approved the reply.