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.
Luo Ding, a county-level city under the jurisdiction of Guangdong Province, is hosted by Yunfu City. In ancient times, it was called Yuzhou, also known as Longxiang. Located in the west of Guangdong Province, south of the Xijiang River, it is the traffic hub of Xijiang Corridor. It has been regarded as a great defense and an important place in Fusui since ancient times. In the Ming Dynasty, it was also known as the "pivot of the whole Guangdong Province". It was once an important military town in the southwest of Shouling in the town of Guangdong. Luoding is one of the gateways for the southwest provinces to enter Guangdong, and it is also the window for Guangdong to radiate to the great southwest of China. Luoding is an important node city in the Pearl River-Xijiang Economic Belt. The central, northeastern and southern parts of Luoding City are basins and hills. Luoding Basin is the largest basin in Guangdong, with a unique basin climate, and the plain landforms of Luoding are mainly distributed here. Luoding is the first batch of famous historical and cultural cities in Guangdong Province. In 2012, Luo Ding was included in the pilot project of financial reform in counties directly under the control of Guangdong Province. two hundred and one