Descriptions for the cover image: The Danjiangkou Reservoir, as the mere water source for the South-to-North Diversion Project of China，is located in the upper Hanjiang River, which is at the borders of Shaanxi, Hubei and Henan provinces. The reservoirs holds an area of 1022 km²（when the water lelel reaches 170m), with a capacity of 290×10⁸m³ and water resource of 374×10⁸m³ (multi-year mean in-lake) (Photographed by Hu Wenbo).