Bayi South Street is located in District 2 of Beijing, China. This area is known for its historical significance and modern development. The street itself is a part of the larger Haidian District, which is one of the most prominent districts in Beijing. District 2 is particularly notable for its concentration of educational institutions, including prestigious universities such as Peking University and Tsinghua University. The presence of these institutions has contributed to the cultural and intellectual vibrancy of the area.

The data supporting this classification comes from the Beijing Municipal Government's official district boundaries and the historical records of the city. According to the Beijing Municipal Bureau of Statistics, Haidian District covers an area of approximately 43 square kilometers and has a population of over 1.6 million. The district is divided into several sub-districts, with Bayi South Street being part of the second sub-district. This division is based on administrative convenience and the historical development of the city.

The historical significance of Bayi South Street is further highlighted by its role in the May Fourth Movement of 1919, a pivotal event in Chinese history that marked the beginning of the New Culture Movement. The street was the site of protests and demonstrations by students and intellectuals, who were advocating for political and cultural reforms. This movement had a profound impact on Chinese society and laid the groundwork for the modernization of the country.

In recent years, Bayi South Street has undergone significant urban development, with the construction of modern residential complexes, commercial centers, and public facilities. This development has been part of the broader plan to rejuvenate the city and provide better living conditions for its residents. The integration of historical and cultural heritage with modern amenities has made Bayi South Street a unique and vibrant part of Beijing's urban landscape.

In conclusion, Bayi South Street belongs to District 2 of Beijing, China, a district known for its educational institutions and historical significance. The street's role in the May Fourth Movement and its subsequent development reflect the rich cultural and intellectual heritage of the area.