Lagoon ecosystems are coastal bodies of water that are partially enclosed by land, often separated from the ocean by a barrier such as a sandbar or coral reef. These ecosystems are characterized by shallow waters, which can vary in salinity and temperature, creating unique habitats for a variety of plant and animal species. Common organisms found in lagoons include seagrasses, mangroves, and various fish and invertebrates. Lagoons play a crucial role in coastal protection, water filtration, and providing nursery grounds for marine life. They support biodiversity and serve as important areas for bird migration and breeding. Additionally, lagoons can be affected by human activities, such as pollution and development, which can threaten their ecological balance.