The most populated area in Nanning, China, is the city center, particularly the districts of Qingxiu and Qingping. These areas have seen significant urban development and are home to a high concentration of residential, commercial, and administrative buildings. According to the latest data from the Nanning Municipal Bureau of Statistics, the population density in these districts is approximately 30,000 to 40,000 people per square kilometer, which is significantly higher than the city's average density.

The reason for the high population density in these areas is primarily due to historical and economic factors. Qingxiu and Qingping have been the central business districts of Nanning since the city's founding in the 4th century. Over the centuries, they have been the focal points for trade, government, and cultural activities, attracting a large number of residents and businesses. The city's rapid economic growth in recent decades has further intensified the population influx, as more people move to Nanning for employment opportunities.

The city center also benefits from excellent infrastructure, including a well-developed transportation network, access to public services, and proximity to major landmarks and attractions. These factors make the city center an attractive place to live, work, and visit, contributing to its high population density.

In contrast, areas outside the city center, such as the districts of Xingbin and Longan, have lower population densities, with around 10,000 to 15,000 people per square kilometer. These districts are characterized by more suburban and rural environments, with a mix of residential, industrial, and agricultural land uses. While these areas offer a quieter lifestyle and more space, they do not have the same level of amenities and economic opportunities as the city center.

In conclusion, the city center of Nanning, particularly the districts of Qingxiu and Qingping, is the most populated area due to historical, economic, and infrastructural factors. The high population density in these areas reflects the city's growth and development over the years, as well as the increasing demand for urban living spaces.