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.
Zhenglan Banner is a flag belonging to Xilingol League of Inner Mongolia Autonomous region. it is located in the south of Inner Mongolia Autonomous region and the southern end of Xilingol League in Paradise grassland. It is only 180 kilometers away from the capital Beijing. It is the nearest typical grassland area to Beijing. Longitude 116.02 °east, latitude 42.25 °north. Zhenglan Banner has a total area of 10182 square kilometers, a total population of 83000 and a peak population of 105000. It is a multi-ethnic area dominated by Mongolians. It is Hunshandake sandy land in the north, showing the natural scenery of sandy grassland, and low mountains and hills in the south, showing the beauty of meadow steppe. Zhenglan Banner is rich in water resources, including 21 rivers and 147 lakes. The banner is rich in wild animal and plant resources. There are 708 species of plants and rare fields in the banner.