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Denver (/ˈdɛnvər/) is a consolidated city and county, the capital, and most populous city of the U.S. state of Colorado. Its population was 715,522 at the 2020 census, a 19.22% increase since 2010. It is the 19th-most populous city in the United States and the fifth most populous state capital. It is the principal city of the Denver–Aurora–Lakewood, CO Metropolitan Statistical Area and the first city of the Front Range Urban Corridor.

Denver is located in the Western United States, in the South Platte River Valley on the western edge of the High Plains just east of the Front Range of the Rocky Mountains. Its downtown district is immediately east of the confluence of Cherry Creek and the South Platte River, approximately 12 miles (19 kilometres) east of the foothills of the Rocky Mountains. It is named after James W. Denver, a governor of the Kansas Territory. It is nicknamed the Mile High City because its official elevation is exactly one mile (5280 feet or 1609.344 meters) above sea level.[a] The 105th meridian west of Greenwich, the longitudinal reference for the Mountain Time Zone, passes directly through Denver Union Station.

Denver is ranked as a Beta world city by the Globalization and World Cities Research Network. The 10-county Denver-Aurora-Lakewood, CO Metropolitan Statistical Area had a population of 2,963,821 at the 2020 United States census, making it the 19th most populous U.S. metropolitan statistical area. The 12-county Denver-Aurora, CO Combined Statistical Area had a population of 3,623,560 at the 2020 United States census, making it the 17th most populous U.S. primary statistical area. Denver is the most populous city of the 18-county Front Range Urban Corridor, an oblong urban region stretching across two states with a population of 5,055,344 at the 2020 United States Census. Its metropolitan area is the most populous metropolitan area within a 560-mile (900 km) radius and the second most populous city in the Mountain West after Phoenix, Arizona. In 2016, it was named the best place to live in the United States by U.S. News & World Report.

Kaifeng, known as Bianzhou and Bianliang in ancient times, is a prefecture-level city in Henan Province. It is a cultural tourism city approved by the State Council and one of the central cities in the core area of the Central Plains urban agglomeration. By 2018, the city had jurisdiction over five districts and four counties, with a total area of 6266 square kilometers, a built-up area of 129.93 square kilometers, a resident population of 4.5649 million, and an urban population of 2.23 million, with a urbanization rate of 48.9%. Kaifeng is located in the hinterland of the Central Plains, the shore of the Yellow River, adjacent to Zhengzhou in the west. Kaifeng Free Trade Zone is one of the three major free trade pilot zones in China (Henan). It is the first batch of famous national historical and cultural cities with a history of more than 4100 years, including Xia Dynasty, Wei State in the warring States period, Hou Liang, Hou Jin, Hou Han, Hou Zhou and Song Dynasty in the five dynasties.
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