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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.

Huanning County, a subordinate county of Yuxi City, Yunnan Province, is located on the southern edge of the lake basin area of the central Yunnan plateau and belongs to the Zhongshan type landform. It is bordered by Maile County in the east, Jianshui County in the south, Tonghai County and Jiangchuan County in the west, Chengjiang County and Yiliang County in the north. The territory is 34 km wide from east to west, 59 km from north to south, with a total area of 1313 square kilometers, with a mountain area of 89%. It is located between 23 °59'N and 24 °34 °N and 102 °49'E to 103 °09'E. the terrain is high in the northwest, low in the southeast, narrow in east and west, long in the north and south, undulating mountains and mountains, hills, basins and valleys interlaced with "two ridges and two grooves". The larger basins are Ningzhou Dam and Panxi Dam. The main rivers are Nanpan River, Qinglong River, Haikou River, Longdong River and Huaxi River, all of which belong to the Pearl River system.
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