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.
Lingwu, known as Lingzhou in ancient times. Ningxia Hui Autonomous region has jurisdiction over county-level cities, which is the core area of industrial development in Ningxia Hui Autonomous region and Yinchuan City. Lingwu is known as "south of the Yangtze River" and has a long history of civilization. as early as the late Paleolithic Age more than 30,000 years ago, human beings thrived in the magical land of Lingwu, which is one of the birthplaces of the ancient civilization of the Chinese nation. It has been more than 2200 years since Lingwu bought the county in the fourth year of Emperor Huidi of the Western Han Dynasty (191 BC). Lingwu is rich in tourism resources and many places of interest. The famous Shuidonggou is the earliest Paleolithic human cultural site found in China, and is known as "the birthplace of Chinese prehistoric archaeology". The Lingwu dinosaur fossil site 160 million years ago is a large area, concentrated distribution, well-preserved and surrounding environment in China.