This photo was taken on the Tonlé Sap, Cambodia, a large body of water (Cambodian meaning "Large Fresh Water River" but more commonly translated as "Great Lake"), it is a combined lake and river system of huge importance to Cambodia. It is the largest freshwater lake in South East Asia and is an ecological hot spot The Tonlé Sap is one of the most productive inland fisheries in the world, supporting over 3 million people and providing over 75% of Cambodia's annual inland fish catch and 60% of Cambodians' protein intake. As this is a unique ecological phenomenon, in 1997, it was successfully nominated Tonlé Sap Biosphere Reserve by UNESCO. You can visit more in dedicated Cambodia folder.
Here is the B&W version.