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.
Yongshan County, which belongs to Zhaotong City, is located in the northeast of Yunnan Province. Xiluodu Hydropower Station is the second largest hydropower station in China and the third largest hydropower station in the world. In 1727, the governor of Yungui Ertai suppressed Pingmitie, and the county was named "Yongshan" by the imperial court, which meant to obey discipline forever. In 2014, Yongshan County has jurisdiction over 6 towns and 9 townships, with 4 neighborhood committees and 133 administrative villages. The county government is stationed in Xiluodu Town, 680 kilometers southwest from the provincial capital Kunming and 200 kilometers south from Zhaotong Municipal Government. Located at the northwest edge of Zhongshan Mountain in northeastern Yunnan, the plateau is broken because it is cut by the Jinsha River and its tributaries. The highest elevation is 3199.5 meters, and the lowest elevation is 340 meters. The main rivers are Jinsha River, Sabina River, Damotan River, Jingdi River, Longchong River and so on. It belongs to the humid climate of the subtropics.