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Audrey Azoulay, Director General of the UN Educational, Scientific and Cultural Organization (UNESCO), made the appeal in her message for the International Day for the Conservation of the Mangrove Ecosystem, observed on 26 July. Mangroves are found in tropical and sub-tropical regions, on the boundary between land and sea. Globally, they cover a surface of just 14.8 million hectares, or roughly equivalent to the size of Greece.