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.
Hotan area, one of the five regions of Xinjiang Uygur Autonomous region, is based in Hotan City. Located in the southern corner of Xinjiang Uygur Autonomous region, the center is located at 79.92 °east longitude and 37.12 °north latitude, reaching the border between Kunlun Mountains and Tibet Autonomous region to the south, Taklimakan Desert to the north and Aksu to the north, Bayingol Mongolia Autonomous Prefecture to the east, Kashmir to the west, Karakoram Mountains to the southwest and Kashmir to the southwest. It is about 670 km long from east to west and 570 km wide from north to south. The total area is 247800 square kilometers. Hotan area is a typical inland arid area, located in the hinterland of Eurasia, with an arid and desert climate. There are 36 large and small rivers. It is an area rich in light energy resources in China. It is famous for its rich in Hetian jade.