Aerial photo taken on Oct. 20, 2018 shows the scene of an overflow from a landslide-caused barrier lake on the Yarlung Tsangpo River in Menling County, southwest China's Tibet Autonomous Region. Water levels are dropping after an overflow at a barrier lake formed after a landslide in the Yarlung Tsangpo River in southwest China's Tibet Autonomous Region, local officials said Friday. (Xinhua/Purbu Zhaxi)