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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.

Heilongjiang Province, referred to as "black", the provincial capital Harbin, is the northernmost and easternmost provincial administrative region in China, with a total area of 473000 square kilometers. The geomorphological feature of Heilongjiang Province is "five mountains, one water and one grass". The terrain is generally high in the northwest, north and southeast, and low in the northeast and southwest, which is composed of mountains, platforms, plains and water surfaces; the land spans the four major river systems of Heilongjiang, Wusuli River, Songhua River and Suifenhe, belonging to cold temperate and temperate continental monsoon climate. Heilongjiang Province, located in the hinterland of Northeast Asia, is an important passage from Asia and the Pacific to Russia and the European continent, and an important window for China to open along the border. As of August 2019, Heilongjiang Province had jurisdiction over 12 prefecture-level cities and 1 district; there were 54 municipal districts, 21 county-level cities, 45 counties,
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