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Tourists visit the Daigu landform scenic spot in east China's Shandong Province, Aug. 30, 2019. Daigu, castle-shaped land formation, is a landform unique to the central and southern parts of Shandong Province, particularly the Yimeng Mountain region. Yimengshan geopark received UNESCO Global Geopark Label in 2019. (Xinhua/Wang Kai)