Wuhan is the largest metropolis and a regional hub city in Central China and a super-large city in the middle and lower reaches of the Yangtze River. The Yangtze River, the world's third largest river, and its longest branch, Han River, cross Wuhan and divides Wuhan into three towns: Wuchang, Hankou, and Hanyang. Libai, the poet of Tang Dynasty wrote here, “When I blow jade flute in Yellow Crane Tower, I find the plum blossom falls down in May of Jiangcheng.” Thus, Wuhan is also named Jiangcheng in Chinese(meaning "city of Yangtze River").