Emeishan is one of the four most sacred Buddhist Mountains in China. Qingcheng Mountain is located just southwest of Dujiangyan. Mt. Qingcheng is also known as Green City Mountain because the towering peaks covered with a dense forest of ancient trees are thought to resemble city battlements. Jiuzhaigou is a deep valley of stunning natural beauty, approximately 620 square kilometers (240 square miles) and is located in north Sichuan. Huang Long Valley has some of the most beautiful scenery in the world. The Dujiangyan Irrigation Project was completed around 250 BC during the Warring States Period. Leshan Giant Buddha is an enormous statue carved into the side of Lingyun Mountain.