The geographical term that describes the area where a river meets the sea is called an estuary. Estuaries are dynamic environments where freshwater from rivers mixes with saltwater from the ocean, creating nutrient-rich habitats. These areas are essential for various ecosystems, providing crucial breeding grounds for fish and wildlife. They serve as important buffers against flooding and erosion while supporting diverse plant and animal species. Estuaries also hold significant economic importance, offering resources such as fisheries, transportation routes, and recreational opportunities for communities.