This A-Z glossary of water and hydrology-related terminology is provided by the United States Geological Survey (USGS) as part of their Cartography and Publishing Program, in the General Interest Publications category. The glossary contains a broad collection of terms (some of which are interlinked within the glossary) that cover most aspects of hydrological systems, including water chemistry, microbiology in aqueous systems, aspects of hydrogeology, sediments, and some structural geology terms. Also provided are the sources of the terminology and references, and links in the glossary to other relevant publications.