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Washington, D.C., formally the District of Columbia, also known as Washington or D.C. or locally simply as the District, is the capital city and federal district of the United States. It is located on the east bank of the Potomac River, which forms its southwestern and southern border with the U.S. state of Virginia, and it shares a land border with the U.S. state of Maryland on its other sides. The city was named for George Washington, a Founding Father and the first president of the United States, and the federal district is named after Columbia, the female personification of the nation. As the seat of the U.S. federal government and several international organizations, the city is an important world political capital. It is one of the most visited cities in the U.S., with over 20 million annual visitors as of 2016.

The U.S. Constitution provides for a federal district under the exclusive jurisdiction of Congress; the district is not a part of any U.S. state (nor is it one itself). The signing of the Residence Act on July 16, 1790, approved the creation of the capital district located along the Potomac River near the country's East Coast. The City of Washington was founded in 1791, and Congress held its first session there in 1800. In 1801, the territory, formerly part of Maryland and Virginia (including the settlements of Georgetown and Alexandria), officially became recognized as the federal district. In 1846, Congress returned the land originally ceded by Virginia, including the city of Alexandria; in 1871, it created a single municipal government for the remaining portion of the district. There have been efforts to make the city into a state since the 1880s, a movement that has gained momentum in recent years, and a statehood bill passed the House of Representatives in 2021.

Lanzhou, referred to as "Lanzhou" or "Gao", or Jincheng in ancient times, is the capital of Gansu Province, an important industrial base and comprehensive transportation hub in northwest China approved by the State Council, one of the important central cities in the western region, and an important node city of the Silk Road Economic Belt. By 2018, the city had jurisdiction over five districts and three counties, with a total area of 13100 square kilometers, a built-up area of 321.75 square kilometers, a resident population of 3.7536 million, an urban population of 3.0415 million, and a urbanization rate of 81.03%. Lanzhou is located in northwest China and the central part of Gansu Province. It is located in the geometric center of the land territory of the Chinese mainland. It is a comprehensive transportation hub of railways, highways and aviation in Northwest China. It is also the headquarters of the army organs in the western theater of the Chinese people's Liberation Army. It is also the new Eurasian continental bridge.
Travel Sights In Lanzhou,Lanchow
Travel Notes In Lanzhou,Lanchow