Soon after passing through the town of uppar, the road enters the Gezi gorge. Hongshan is at the mouth of Gaizi canyon. Hongshan mountain is the red mountain of oitak, which is located at the intersection of oitak River and Gaizi river. The fire red mountains are distributed on both sides of Gaizi River and oytak River Valley. The mountain, which is mainly composed of red rocks, is several kilometers long. Hongyan mountain has clear edges and corners, and there is no grass. In the sunshine, the red is dazzling, deeper than the Turpan Flame Mountain, so it is also known as the South Xinjiang Flame Mountain.