Tourists take a walk at Xinghuagou wetland park transformed from the mining subsidence area of Jingxing in Shijiazhuang, north China's Hebei Province, Aug. 24, 2021. In 2015, the last pit in Jingxing mining area was closed and an ecological restoration project was launched in the area. So far, the mining area has been transformed into wetland parks. [Photo by Luo Xuefeng/Xinhua]

Children play at Xinghuagou wetland park transformed from the mining subsidence area of Jingxing in Shijiazhuang, north China's Hebei Province, Aug. 24, 2021. In 2015, the last pit in Jingxing mining area was closed and an ecological restoration project was launched in the area. So far, the mining area has been transformed into wetland parks. [Photo by Luo Xuefeng/Xinhua]

Aerial photo taken on Aug. 24, 2021 shows Qingliangwan wetland park transformed from the mining subsidence area of Jingxing in Shijiazhuang, north China's Hebei Province. In 2015, the last pit in Jingxing mining area was closed and an ecological restoration project was launched in the area. So far, the mining area has been transformed into wetland parks. [Photo by Luo Xuefeng/Xinhua]

Tourists take a walk at Xinghuagou wetland park transformed from the mining subsidence area of Jingxing in Shijiazhuang, north China's Hebei Province, Aug. 24, 2021. In 2015, the last pit in Jingxing mining area was closed and an ecological restoration project was launched in the area. So far, the mining area has been transformed into wetland parks. [Photo by Luo Xuefeng/Xinhua]

Aerial photo taken on Aug. 24, 2021 shows Xinghuagou wetland park transformed from the mining subsidence area of Jingxing in Shijiazhuang, north China's Hebei Province. In 2015, the last pit in Jingxing mining area was closed and an ecological restoration project was launched in the area. So far, the mining area has been transformed into wetland parks. [Photo by Luo Xuefeng/Xinhua]