Late autumn at Jingpohu Global Geopark in Mudanjiang, NE China (7)

A photo taken on October 23, 2021 shows the lava tunnel in the Jingpohu Global Geopark in Mudanjiang City, Heilongjiang Province. The volcanic geological heritage of the park is rare nationwide and is of great scientific significance to research on structural evolution of the Cenozoic in Eastern China. (People’s Daily Online/ Xia Peiyao)