Valley bottom forest is the last scenic spot to be seen before the north slope scenic spot of Changbai Mountain. It is the lowest elevation scenic spot of Changbai Mountain. It is formed by the ground subsidence caused by crustal movement and volcanic eruption. Large areas of forest sink into the valley bottom. The Valley depth is 60 meters, the width is more than 3000 meters, and the length is several kilometers. Here is the natural oxygen bar, the deepest part of the valley bottom forest, and there is a rock fissure under the trestway. You can see the Pentium River, known as "one step across the Songhua River".