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.
Tongxu, known as Xianping in ancient times, has a long history and culture, and now belongs to Kaifeng, the ancient capital of the seven dynasties. Tongxu County is located in the middle and east of Henan Province, the middle and lower reaches of the Yellow River, belonging to the eastern plain of Henan Province. The topography is high in the west and low in the east, high in the north and low in the south, tilting from northwest to southeast. It faces the Yellow River to the north, Songshan Shaolin to the west, Shangqiu, the important town in the east of Henan Province to the east, Zhoukou, a famous historical city to the south, 80 kilometers to the northwest from the provincial capital Zhengzhou, and 40 kilometers to the north to Kaifeng, the ancient capital. Located in the core area of the construction of the national strategic Central Plains Economic Zone, it is the route of Hengxiang railway in the planning. Tongxu County has jurisdiction over six towns and six townships, with a width of 30.5km from east to west and 34.8km from north to south, with a total area of 766.22 square kilometers. It is a part of the Huang-Huai Plain formed by the impact to the south of the Yellow River. The soil area of the county is 963742 mu.