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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.

Tongde County is located in the southeast of Qinghai Province, at the junction of Hainan, Huangnan and Guoluo Tibetan Autonomous Prefecture, and belongs to the people's Government of Hainan Prefecture. The Xijiu Highway, the provincial highway, runs through the whole territory from north to south, and the Yellow River surrounds the county in a half-ring from east to west. The county seat is located 3060 meters above sea level, 256km away from the state capital Chabqa town and 282km away from the provincial capital Xining, with a resident population of about 9000. The climate is typical plateau continental climate, the highest elevation in the county is 4671 meters, the lowest elevation is 2648 meters, the average elevation is 3660 meters, the average annual temperature is 0.4 ℃-0.6 ℃, the average annual precipitation is 440mm, and there is no absolute frost-free period. The county has a total area of 4758 square kilometers and has jurisdiction over 73 administrative villages in 2 towns and 3 townships. In 2009, the total population was 61000.
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