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)
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