A new reference tool provides the most comprehensive data base of 154 of the world's river basins and sub-basins; representing those that cover most of Earth's land surface. It lists indicators and variables for each of these basins and, where appropriate, provides links and references to additional, relevant information.

The “Watersheds of the World” compact disk and Web site was released on 18 March by the World Conservation Union (IUCN). The resource provides information on land cover and land use; population density; basin indicators, including degree of river fragmentation and number of dams; and biodiversity information. It also contains 20 global maps portraying critical water resources issues.