Lava Tunnels

　　Introduction       Located about 13 kilometers southeast of the Underground Forest, there are several rare “lava tunnels” that are seldom seen either in China or abroad, adding an extra layer of mystery to Jingpo Lake.       According to scientists, these “lava tunnels” were formed by a volcanic eruption 4,000 to 8,000 years ago. Their appearance resembles the karst “caves” found in the limestone regions of Guilin, Guangxi, but they are fundamentally different from karst caves.    

　　 Mudanjiang City, Heilongjiang Province