Photo taken on Sept. 2, 2014 shows water birds looking for food at the lake of Gahai in Luqu county of Gannan Tibetan autonomous prefecture, Northwest China's Gansu province. The Gahai Wetland, a source area of China's Yellow River, is growing in both water area and waterfowl numbers since the establishment of a national natural reserve in 2002.

Top wetlands in China-beauty of diversity

Scenery at wetland of Heixiazi Island in NE China