Lagunen is a term that refers to a type of coastal lagoon, which is a shallow body of water separated from a larger body of water, such as an ocean or sea, by a barrier like a sandbar or coral reef. These ecosystems are often rich in biodiversity and serve as important habitats for various species of fish, birds, and other wildlife. Lagunen can also be found in various regions around the world, including areas like the Caribbean and Mediterranean. They play a crucial role in coastal protection, water filtration, and providing recreational opportunities for people. Additionally, they are often sites for research and conservation efforts due to their ecological significance.