• Houston
  • Yan’an

Houston (/ˈhjuːstən/ (listen); HEW-stən) is the most populous city in Texas, the most populous city in the Southern United States, the fourth-most populous city in the United States, and the sixth-most populous city in North America, with a population of 2,304,580 in 2020. Located in Southeast Texas near Galveston Bay and the Gulf of Mexico, it is the seat and largest city of Harris County and the principal city of the Greater Houston metropolitan area, which is the fifth-most populous metropolitan statistical area in the United States and the second-most populous in Texas after Dallas–Fort Worth. Houston is the southeast anchor of the greater megaregion known as the Texas Triangle.

Comprising a land area of 640.4 square miles (1,659 km2), Houston is the ninth-most expansive city in the United States (including consolidated city-counties). It is the largest city in the United States by total area whose government is not consolidated with a county, parish, or borough. Though primarily in Harris County, small portions of the city extend into Fort Bend, and Montgomery counties, bordering other principal communities of Greater Houston such as Sugar Land and The Woodlands.

The city of Houston was founded by land investors on August 30, 1836, at the confluence of Buffalo Bayou and White Oak Bayou (a point now known as Allen's Landing) and incorporated as a city on June 5, 1837. The city is named after former General Sam Houston, who was president of the Republic of Texas and had won Texas's independence from Mexico at the Battle of San Jacinto 25 miles (40 km) east of Allen's Landing. After briefly serving as the capital of the Texas Republic in the late 1830s, Houston grew steadily into a regional trading center for the remainder of the 19th century.

Yan'an City, referred to as "Yan", the prefecture-level city of Shaanxi Province, is the first mausoleum in the world-the mausoleum of the first ancestor of the Chinese nation, the mausoleum of the Yellow Emperor: the site of the Yellow Emperor Mausoleum, is a sacred place for the nation, a sacred place for the Chinese revolution, and the first batch of famous national historical and cultural cities announced by the State Council. Yan'an is located in the north of Shaanxi Province, in the middle reaches of the Yellow River, in the south-central part of the Loess Plateau, and 371 kilometers north of the provincial capital Xi'an. It is connected to Yulin in the north, Xianyang, Tongchuan and Weinan in Guanzhong to the south, Linfen and Luliang in Shanxi to the east, and Qingyang in Gansu to the west. With a total area of 37037 square kilometers, it is known as "Sanqin key, five-way flap throat". Yan'an, known as Fushi and Yanzhou, is an important birthplace of the Chinese nation and the ancestor of humanities.
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