An estuary ecosystem is a unique environment where freshwater from rivers meets and mixes with saltwater from the ocean. This blending creates a rich habitat that supports a diverse range of plant and animal species. Estuaries are often characterized by their muddy or sandy shores, tidal flats, and marshes, which provide essential breeding and feeding grounds for many organisms. These ecosystems play a crucial role in maintaining water quality and protecting coastal areas from erosion. They act as natural filters, trapping pollutants and sediments before they reach the open ocean. Additionally, estuaries serve as important nurseries for various fish species, including salmon and flounder, contributing to both ecological balance and local fisheries.