View of Wudalianchi Geopark in Heihe, NE China

Photo taken on Sept. 2, 2021 shows a limestone cave in the Wudalianchi Geopark in Heihe, northeast China's Heilongjiang Province. The Wudalianchi Geopark is famed for its volcanoes and hot springs. It has 14 volcanoes and five major volcanic barrier lakes. (Xinhua/Xie Jianfei)

Photomontage taken on Sept. 1, 2021 shows the star trails over the Wudalianchi Geopark in Heihe, northeast China's Heilongjiang Province. The Wudalianchi Geopark is famed for its volcanoes and hot springs. It has 14 volcanoes and five major volcanic barrier lakes. (Xinhua/Xie Jianfei)

Aerial photo taken on Sept. 2, 2021 shows the scenery of the Wudalianchi Geopark in Heihe, northeast China's Heilongjiang Province. The Wudalianchi Geopark is famed for its volcanoes and hot springs. It has 14 volcanoes and five major volcanic barrier lakes. (Xinhua/Xie Jianfei)

Aerial photo taken on Aug. 31, 2021 shows a herd of deer running at the foot of the Wohu Mountain in the Wudalianchi Geopark in Heihe, northeast China's Heilongjiang Province. The Wudalianchi Geopark is famed for its volcanoes and hot springs. It has 14 volcanoes and five major volcanic barrier lakes. (Xinhua/Xie Jianfei)

Aerial photo taken on Sept. 2, 2021 shows a volcanic barrier lake in the Wudalianchi Geopark in Heihe, northeast China's Heilongjiang Province. The Wudalianchi Geopark is famed for its volcanoes and hot springs. It has 14 volcanoes and five major volcanic barrier lakes. (Xinhua/Xie Jianfei)

Long-time exposure photo taken on Sept. 1, 2021 shows the starry sky over the Wudalianchi Geopark in Heihe, northeast China's Heilongjiang Province. The Wudalianchi Geopark is famed for its volcanoes and hot springs. It has 14 volcanoes and five major volcanic barrier lakes. (Xinhua/Xie Jianfei)

Aerial panoramic photo taken on Aug. 31, 2021 shows the Laohei Mountain at sunrise in the Wudalianchi Geopark in Heihe, northeast China's Heilongjiang Province. The Wudalianchi Geopark is famed for its volcanoes and hot springs. It has 14 volcanoes and five major volcanic barrier lakes. (Xinhua/Xie Jianfei)

Photo taken on Aug. 31, 2021 shows the stunning view of sunrise in the Wudalianchi Geopark in Heihe, northeast China's Heilongjiang Province. The Wudalianchi Geopark is famed for its volcanoes and hot springs. It has 14 volcanoes and five major volcanic barrier lakes. (Xinhua/Xie Jianfei)

Aerial photo taken on Aug. 31, 2021 shows the stunning view at sunrise in the Wudalianchi Geopark in Heihe, northeast China's Heilongjiang Province. The Wudalianchi Geopark is famed for its volcanoes and hot springs. It has 14 volcanoes and five major volcanic barrier lakes. (Xinhua/Xie Jianfei)

Photo taken on Aug. 31, 2021 shows a barrier lake and a volcano in the Wudalianchi Geopark in Heihe, northeast China's Heilongjiang Province. The Wudalianchi Geopark is famed for its volcanoes and hot springs. It has 14 volcanoes and five major volcanic barrier lakes. (Xinhua/Xie Jianfei)