Ships are seen sailing in Qutang gorge in southwest China's Chongqing Municipality, May 23, 2018. Qutang is one of the Three Gorges (Qutang, Wuxia and Xiling gorges), which extend for about 200 kilometers on the upper and middle reaches of the Yangtze River, the longest in China. They are a popular tourist destination, known for their natural beauty and historical and cultural relics. (Xinhua/Wang Quanchao)