Aerial photo taken on Oct. 20, 2018 shows a damaged road revealed after 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. TO GO WITH: Water level in Tibet barrier lake drops after overflow(Xinhua/Purbu Zhaxi)