Tourists pose for photos by the Yamdrok Lake in Nagarze County of Shannan City, southwest China's Tibet Autonomous Region, April 8, 2018. The Yamdrok Lake, about 100 kilometers south of the region's capital Lhasa, is one of the three holy lakes in the region. (Xinhua/Zhang Rufeng)

Photo taken on April 8, 2018 shows the spring scenery by the Yamdrok Lake in Nagarze County of Shannan City, southwest China's Tibet Autonomous Region. The Yamdrok Lake, about 100 kilometers south of the region's capital Lhasa, is one of the three holy lakes in the region. (Xinhua/Zhang Rufeng)

Photo taken on April 8, 2018 shows the spring scenery by the Yamdrok Lake in Nagarze County of Shannan City, southwest China's Tibet Autonomous Region. The Yamdrok Lake, about 100 kilometers south of the region's capital Lhasa, is one of the three holy lakes in the region. (Xinhua/Zhang Rufeng)

Photo taken on April 8, 2018 shows the spring scenery by the Yamdrok Lake in Nagarze County of Shannan City, southwest China's Tibet Autonomous Region. The Yamdrok Lake, about 100 kilometers south of the region's capital Lhasa, is one of the three holy lakes in the region. (Xinhua/Zhang Rufeng)

Photo taken on April 8, 2018 shows the spring scenery by the Yamdrok Lake in Nagarze County of Shannan City, southwest China's Tibet Autonomous Region. The Yamdrok Lake, about 100 kilometers south of the region's capital Lhasa, is one of the three holy lakes in the region. (Xinhua/Zhang Rufeng)