 The dam has also caused frequent major landslides due to the erosion in the reservoir.These major landslides included two incidents in May 2009 when somewhere between 20,000 and 50,000 cubic metres (26,000 and 65,000 cu yd) of material plunged into the flooded Wuxia Gorge of the Wu River.China's marine environment, including the Yellow Sea and South China Sea, are considered among the most degraded marine areas on earth.