Mangrove forests were once generally dismissed as swampy wastelands. Planners, scientists, and coastal dwellers have now come to value them as the remarkably diverse and important ecosystems they are. Mangroves, seagrass beds, and coral reefs work as a single system that keeps coastal zones healthy. Mangroves provide essential habitat for thousands of species. They also stabilize shorelines, preventing erosion and protecting the land — and the people who live there — from waves and storms.