Australia: Great Barrier reef

The Great Barrier Reef is the world's largest coral reef system composed of over 2,900 individual reefs and 900 islands stretching for over 2,300 kilometres over an area of approximately 344,400 square kilometres.

 Thanks to Ms Helen. She has used Moreton Bay Wetland stamp issued in 2021. It is taken from set of 4 on wetlands of Australia.