This searchable site, from The United Nations Environment Programme, is a clearinghouse for information about freshwater around the globe. The site provides links to UN reports, background guides on key freshwater issues, and many other resources.
Subject: Geoscience:Hydrology Resource Type: Audio/Visual:Maps, Scientific Resources:Collection, Audio/Visual:Images/Illustrations, Datasets and Tools:Datasets Earth System Topics: Human Dimensions:Resources, Hydrology:Surface Water, Ground Water, Human Dimensions:Environmental Quality Topics: Hydrosphere/Cryosphere Data Source: Observational Data Data Derived: Data Derived Science Background Required: Broadly accessible