What is an area where freshwater and saltwater meet provides habitat for a diversity of organisms?

An area where freshwater and saltwater meet is called an estuary. Estuaries are highly productive ecosystems that provide habitat for a diverse array of organisms, including fish, shellfish, birds, and plants. The mixing of fresh and salt water creates a unique environment that is rich in nutrients and oxygen. This makes estuaries ideal for filter-feeding organisms, such as clams and oysters. Estuaries also provide important spawning and nursery grounds for many fish species.