The mysterious Tianshan Grand Canyon, also known as Keziliya Grand Canyon, is a canyon near Keziliya Mountain (a branch of Tianshan Mountain) formed by wind and rain over billions of years. "Keziliya" in Uighur means red cliff. The canyon is as long as 5.5 kilometers from east to west with an average depth of 1,600 meters. The reddish-brown mountains of the grand and rugged canyon are in different shapes, and gullies and trenches can be found everywhere. Some places are too narrow to pass through. The peaks in the canyon are multicolored, and strange-shaped stone formations can be found. [China.org.cn/photo by Qi Jun]