The article discusses the ancient river Jiduanshui and Mingze Lake during the Han and Tang Dynasties. The researchers explored the location and history of these water bodies, which are important for understanding the geography of northwest China. Despite Jiduanshui drying up today, Mingze Lake was a significant feature with specific dimensions. The researchers conducted surveys and analyzed historical texts to investigate the changes in the river course and environment over time. Their findings shed light on the past geography of the region and the impact of these changes on the landscape.