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.
Lianzhou, a county-level city hosted by Qingyuan City, Guangdong Province, is located in the northwest of Qingyuan City, Guangdong Province, the upper reaches of Xiaobei River, Yangshan County in the southeast, Liannan County in the southwest, Lanshan County and Jianghua County in Hunan Province in the northwest, Linwu County in Hunan Province in the north and Yizhang County in Hunan Province in the northeast, with a total area of 2663.33 square kilometers. Lianzhou City is located at the southern foot of Mengzhuling in Nanling, with mountains on the west, north and east, and slightly lower in the middle. It belongs to the subtropical monsoon climate zone, which is affected by the monsoon all the year round. The river in the territory belongs to the Lianjiang River system, a tributary of the Beijiang River (a tributary of the Pearl River). As of 2014, Lianzhou has jurisdiction over 10 towns and 2 ethnic townships. In 2016, Lianzhou had a resident population of 382200, with 29 ethnic groups, with the Han nationality as the main ethnic group and a minority.