The eastern group is estimated to contain around 3000-4000 cranes, over 95% of the total population. In 2008, 3,750 individuals were counted at Poyang Lake in China, one of the breeding sites. This group of cranes breeds in the Yakutia region of northeastern Siberia and spends the winter in the Yangtze River valley. However, cranes sometimes are found in areas like Mongolia, Japan, and Korea, although they do not breed there.