Aerial photo taken on June 23, 2018 shows wetland of the Yellow River Delta national natural reserve in Dongying, east China's Shandong Province. The Yellow River, the second longest river in China, originates on the Qinghai-Tibet Plateau and empties into the Bohai Sea from Dongying City. The city has been making efforts to promote ecological civilization and accelerate the construction of "wetland city". (Xinhua/Guo Xulei)