Aerial view shows drift ice floating in the Kaidu River with snow on the river bank in Hejing County, northwest China's Xin gian g Uyghur Autonomous Region, Dec. 15, 2022. (Photo/China News Service) The 610-kilometer Kaidu River, the fourth largest river in Xin gian g, originates from the Tianshan Mountains with an altitude of 4,000 meters above sea level. It finally flows into Bosten Lake, the country's largest inland freshwater lake.