Los Angeles (US: /lɔːs ˈændʒələs/ (listen) lawss AN-jəl-əs;[a] Spanish: Los Ángeles [los ˈaŋxeles], lit. 'The Angels'), often referred to by its initials L.A., is the largest city in the state of California and the second most populous city in the United States after New York City, as well as one of the world's most populous megacities. Los Angeles is the commercial, financial, and cultural center of Southern California. With a population of roughly 3.9 million residents within the city limits as of 2020, Los Angeles is known for its Mediterranean climate, ethnic and cultural diversity, being the home of the Hollywood film industry, and its sprawling metropolitan area. The city of Los Angeles lies in a basin in Southern California adjacent to the Pacific Ocean in the west and extending through the Santa Monica Mountains and north into the San Fernando Valley, with the city bordering the San Gabriel Valley to its east. It covers about 469 square miles (1,210 km2), and is the county seat of Los Angeles County, which is the most populous county in the United States with an estimated 9.86 million residents as of 2022.
Dingbian County is located in the northwest of Shaanxi Province, the westernmost end of Yulin City, and the junction of seven counties (banners) of four provinces (regions) of Shaanxi, Gansu, Ningxia and Inner Mongolia. In ancient times, it is said that "Yuyan is connected to the east, Ganliang to the west, Huanqing to the south, pillow desert to the north, Tu Guang Bian long, and Sanqin fortress". It is the northwest gate of Shaanxi Province and the west gate of Yulin City. Since ancient times, merchants have gathered, known as "dry wharf". The county has jurisdiction over 1 subdistrict office, 14 towns and 4 townships. Mineral resources such as oil, natural gas, raw salt, mirabilite, magnesium sulfate and magnesium chloride have many advantages, which are an important part of the energy and heavy chemical industry base in northern Shaanxi. The domestic oil resources are widely distributed, with proven reserves of 1.618 billion tons, making it the largest county in oil production capacity in the country. Dingbian County is also the salt producing area of Shaanxi Province, with 14 salt lakes and a total area of 98 square kilometers. In addition, the whole county