US Environmental Protection Agency
Epa: Exploring Estuaries
Find click-through tours of estuaries in New York and in Louisiana that provide sustained reading on the science of river deltas. Text is supported by illustrations and a glossary of special terms.
PBS
Nh Pbs: Nature Works: Rivers and Streams
Learn more about Rivers and Streams through this educational resource. This site features photographs, a description, fun facts, and more about this type of freshwater ecosystem.