Guoan is a city in the Jiangsu Province, China. It has a population of about 5 million people and is one of the largest cities in the province. The city's name means "Great Wall City" and it is named after its famous Great Wall.

The city is known for its rich history and culture. Guoan is home to many ancient buildings and monuments, including the Great Wall of China, which runs through the city. The Great Wall was built during the Ming Dynasty (1368-1644) as part of the defense against invasions by foreign powers.

In addition to the Great Wall, Guoan also boasts several other attractions such as the Nanjing Museum, the Nanjing Art Museum, and the Nanjing Zoo. These museums and zoos offer visitors a chance to learn more about Chinese culture and history.

Another popular attraction in Guoan is the Nanjing University. The university is one of the oldest universities in China and offers students a chance to study various subjects from different disciplines.

Overall, Guoan is a beautiful city with a rich history and culture. Its many attractions make it a great destination for tourists and locals alike.