Uit Kust Wiki
A semi-enclosed embayment of the coast in which fresh river water entering at its head mixes with saline water entering from the ocean. Fully developed estuarine systems consist of complex dynamic interactions between channels, tidal flats, middle ground shoals and salt marshes. Estuaries are of particular ecological value and significance because they provide important natural values concerning, for example, fish and wildlife habitat, flood protection, and maintenance of water quality. ..
"Estuary" is one of the ecosystem sub-categories within the section dealing with biodiversity of coastal and marine habitats and ecosystems.
- CoPraNet glossary