Mangrove ecosystems are one of the four most productive tropical coastal marine habitats. CGTN's Tides of Change crew visit the mangrove forest in Fangchenggang in south China's Guangxi Zhuang Autonomous Region. It is a unique transboundary mangrove forest in China with high species richness and is of global significance as a flyway for international migratory birds and a suitable habitat for fish. Join us to find out how it provides ecological services and ensures ecological security.