After the worst drought in a century on the Mekong, Southeast Asia's largest lake, Tonle Sap, saw a late high-water season that further devastated its ecology. Decades of dambuilding on the Lancang have removed sediment crucial to the health of Tonle Sap and the lack of reliability in the flood pulse is damaging to the region's economy and agriculture. Similarly, flood control dams and large hydropower projects such as the Nam Ou Cascade have put further strain on the most productive freshwater fishery in Asia. In addition to the development of large mainstream dams from the Himalayas to Laos, recent data suggests that China has intentionally held back water resources from downriver countries.