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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.

Yiyuan County, which belongs to Zibo City, Shandong Province, is located in the middle of Shandong Province, Linqu County of Weifang City to the east, Yishui County to the southeast, Laiwu District and Gangcheng District of Jinan City to the west, Xintai City of Taian City to the southwest, Mengyin County of Linyi City to the south, and Boshan District and Zichuan District to the north. In 1944, it established a county with a total area of 1636 square kilometers, with 10 towns, 2 streets, 1 provincial economic development zone and 643 villages (communities) under its jurisdiction by 2017. As of December 31, 2017, the total population of Yiyuan County is 569900. Yiyuan is the roof of Shandong Province, China, with an average elevation of 401 meters, which is the highest in Shandong Province. There are 1983 famous hills in the territory, and the highest elevation of Mount Lushan is 1108 meters, which is the fourth peak in Shandong Province. There are 1530 large and small rivers.
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