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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.

Yanyuan County, which belongs to Liangshan Yi Autonomous Prefecture of Sichuan Province, is located on the southeast edge of the Qinghai-Tibet Plateau in Sichuan Province and on the west bank of the lower reaches of the Yalong River. The geographical coordinates are: longitude 100 °42 °09 "- 102 °03 °44" east and latitude 27 °06 °31-28 °16 °31 "north. Across the Yalong River from Xichang City, Dechang County and Miyi City in the east, Yanbian County in the south, Ningyi County in Yunnan Province in the west, and Muli Tibetan Autonomous County and Mianning County in the north. As of 2012, Yanyuan County covers an area of 8398.6 square kilometers and has a population of 356000. Yanyuan County, which belongs to Sichuan Province, contains 41 kinds of mineral resources, such as salt, iron, gold, etc.; it is rich in many kinds of rare animals, such as black-crowned crane, bear, Swertia, etc., and is rich in apple, Phnom Penh melon seeds and other famous and special products, which is the apple production in southwest China.
Travel Guides In Yanyuan county
Travel Sights In Yanyuan county
Travel Notes In Yanyuan county
2014 Lugu Lake self-driving tour (4) Lugu Lake, Lige watching the sunrise
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2014 Lugu Lake self-driving tour (1) Lugu Lake, Ya'an→Xichang
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2014 Sichuan Lugu Lake Self-driving Tour (February 1) Lugu Lake, Lover's Bay in the morning
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2014 Sichuan Lugu Lake Self-driving Tour (8) Lugu Lake, Daluoshui Village
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