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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.

Heishui is located in the east of the Qinghai-Tibet Plateau, in the middle of Aba Tibetan and Qiang Autonomous Prefecture, connected with Songpan in the north, Hongyuan and Maoxian in the east and west, Lixian and Malkang in the south and southwest, 284km away from the provincial capital Chengdu, and the county seat is 2350 meters above sea level. Heishizang is called "Cuoqu", which means "water of pig iron". Heishui River is a tributary of the upper reaches of Minjiang River. There are 99 small Heishui River, Mauergai River and gully. Heishui territory of the natural scenery Jun Xiu, strange, unique cultural scenery. There are mainly three Olympic Snow Mountains, Custer Landscape, Dagu Glacier, the lowest, largest and youngest glacier in the world at the same latitude, the Milk ditch Colored Forest, known as the 80-mile Gallery, Selgu Tibetan Village and other unique Tibetan dwellings, and Yaxia National Forest Park. Heishui is the place passed by the Red Army on the long March.
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