Mudanjiang underground forest is a national nature reserve. The original forest belt formed by lava craters, which geologists call the crater virgin forest. It is located about 50 kilometers northwest of Jingbo Lake and is located in the deep mountainous area of Zhangguangcailing, one kilometer above sea level. Among the ten craters with steep and varying internal walls, except for the craters 1 to 3, the rest of the craters forest are connected to the slow slope to form a forest sea. It is rare to grow such dense forests in more than 800 craters in China. Not only is it a wonder of Jingbo Lake Scenic Area, but also a research base for Chinese and foreign geographers, historians, and biologists. 【scenery】【interest】【cost performance】