Nanjing city. According to the Nanjing Municipal Government Network, Gulou District is located on the south bank of the lower reaches of the Yangtze River, in the northwest of Nanjing. It is one of the downtown areas of Nanjing and belongs to Nanjing. Gulou District, located in the middle of Nanjing, is one of the eight districts of Nanjing's main city, and is an important scientific and technological innovation center and shipping logistics service center in China.