Photo taken on June 16, 2019 shows a pothole landscape along the Shenyu River valley in Huoshi Village of Tieliu Township, Huidong County, Southwest China's Sichuan Province. (Photo: Xinhua)

Photo taken on June 16, 2019 shows a pothole landscape along the Shenyu River valley in Huoshi Village of Tieliu Township, Huidong County, Southwest China's Sichuan Province. (Photo: Xinhua)

Photo taken on June 16, 2019 shows a pothole landscape along the Shenyu River valley in Huoshi Village of Tieliu Township, Huidong County, Southwest China's Sichuan Province. (Photo: Xinhua)

Photo taken on June 16, 2019 shows a pothole landscape along the Shenyu River valley in Huoshi Village of Tieliu Township, Huidong County, Southwest China's Sichuan Province. (Photo: Xinhua)

Photo taken on June 16, 2019 shows a pothole landscape along the Shenyu River valley in Huoshi Village of Tieliu Township, Huidong County, Southwest China's Sichuan Province. (Photo: Xinhua)

Photo taken on June 16, 2019 shows a pothole landscape along the Shenyu River valley in Huoshi Village of Tieliu Township, Huidong County, Southwest China's Sichuan Province. (Photo: Xinhua)

Photo taken on June 16, 2019 shows a pothole landscape along the Shenyu River valley in Huoshi Village of Tieliu Township, Huidong County, Southwest China's Sichuan Province. (Photo: Xinhua)

Photo taken on June 16, 2019 shows a pothole landscape along the Shenyu River valley in Huoshi Village of Tieliu Township, Huidong County, Southwest China's Sichuan Province. (Photo: Xinhua)