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.
Liuba County is located in the southwest of Shaanxi Province, north of Hanzhong City. Located in the southern foot of the Qinling Mountains, the upper reaches of the Han River, "face Ba Shu and back Qinchuan", is a subtropical humid monsoon climate zone, no heat in summer and no severe cold in winter. The geological and geomorphological features are unique, with a long history, rich resources and convenient transportation, which has been known as the "throat of the Qin and Han dynasties". It is 46.4 km long from east to west and 67.2 km wide from north to south. The county seat is 367km away from Xi'an and 85 km away from Hanzhong, with 2.725 million mu of forestry land and 89000 mu of agricultural land, which is one of the forestry counties in Shaanxi Province. On September 25, 2018, he won the honorary title of "2018 e-commerce into rural comprehensive demonstration county" of the Ministry of Commerce. On May 7, 2019, the people's Government of Shaanxi Province approved Liuba County to withdraw from the poverty-stricken county sequence.