Colorado Springs is a home rule municipality in, and the county seat of, El Paso County, Colorado, United States. It is the largest city in El Paso County, with a population of 478,961 at the 2020 United States Census, a 15.02% increase since 2010. Colorado Springs is the second-most populous city and the most extensive city in the state of Colorado, and the 40th-most populous city in the United States. It is the principal city of the Colorado Springs metropolitan area and the second-most prominent city of the Front Range Urban Corridor. It is located in east-central Colorado, on Fountain Creek, 70 miles (113 km) south of Denver.
Tongguan County, which belongs to Weinan City, Shaanxi Province, is located at the eastern end of Guanzhong Plain in Shaanxi Province. It is bordered by Lingbao City, Henan Province in the east, Huayin City in the west, Luonan County in the south, Dali County in the northwest, and Ruicheng County in Shanxi Province across the Yellow River in the north. It is between longitude 110o 090032 "- 110o 25027" east and latitude 34o 230033 "- 34o 390001" north, with a total area of 526 square kilometers. In 2018, Tongguan County had a resident population of 154200, with a regional gross domestic product (GDP) of 4.035 billion yuan, of which the added value of the primary industry was 484 million yuan, the secondary industry was 1.446 billion yuan, the tertiary industry was 2.104 billion yuan, and the primary, secondary and tertiary industries accounted for 12.0% and 35.8% of the GDP, respectively.