The once mighty Mekong river is at a 50 year low in parts of Thailand and Laos.
Chinese companies have started construction on two hydroelectric dams in Cambodia, one on a tributary of the Mekong River.
The government though has much to lose by being too critical of China which continues to pump billions of dollars into Cambodias infrastructure.
Nations around the Mekong are meeting in Thailand to discuss the vital river's low water levels.
Al Jazeera's Wayne Hay went to northern Cambodia where the lack of water is affecting people's livelihoods.