Compared with Jingbo Lake, I still like this valley bottom forest. There are 3.4 bus stops along the way. The first stop is the karst caves formed by volcanic magma. Unlike the karst caves formed by Kanas landform, the karst caves are mostly stratified rocks and fault structures. The second stop is the valley bottom forest. Walk the wooden trestle road into the bottom of the forest. It is cool to the bottom. There are ice caves, fog caves and fairy caves. The third stop is the volcanic crater forest. Walk around for nearly an hour. The steps up and down the hill are not low. People with poor physical strength should enter carefully. They should not go back and walk in and out at the same time. About 10,000 years ago, volcanic eruptions formed seven volcanic craters of varying diameters and underground caves formed by magma flow. The broad-leaved Korean pine forest formed on the original bare land is the climax community of forest succession, commonly known as "underground forest", and its top is an obsidian stone. It will be down the hill soon after crossing the Obsidian stones.