Which city was ancient health?

In ancient times, Jiankang was Nanjing. Jiankang was the name of Nanjing in the Six Dynasties. It is the capital of Wu Dong, Jin Dong, Liu Song, Nanqi, Nanliang and Chen Nan for six generations. It was the economic, cultural, political and military center of China at that time, the first city with a population of over one million in the world, and the largest city in the world at that time.

Jiankang City is 40 miles east, west, north and south (about 130 square kilometers), with triple palace walls, Qinhuai in the south, Houhu in the north and Yangtze River in the west. Gardens are mainly distributed in the northeast of Beijing. There is Hualin Garden in the north of Gongcheng, and the Leyuan Garden covers Zhoushan, with palaces such as Hualin Garden and Tianyuan Pool dotted in it. Surrounded by many satellite cities such as Stone City, Xizhou City, Dongfu City, Baixia City and Nanlangxie County City, it has become an isolated case in the history of urban construction in China. The official temples are arranged on both sides of the imperial road from Xuanyangmen to Zhuquemen. Residential alleys are mainly distributed on both sides of Imperial Road and beside Qinhuai River, and there are more than 500 Buddhist temples all over the city.