What is the largest living structure on Earth?

The largest living structure on Earth is the Great Barrier Reef, located off the northeastern coast of Australia in the Coral Sea. Stretching over 2,300 kilometres (1,430 miles), it is composed of thousands of individual coral reefs and islands. The reef is home to a diverse range of marine life, including turtles, sharks, and colourful corals. It is a UNESCO World Heritage Site and a vital ecosystem for the planet. Despite its significance, the reef faces threats from climate change, coral bleaching, and pollution.