The largest coral reef system located off the coast of Australia is the Great Barrier Reef. Stretching over 2,300 kilometers, it is the world's largest coral reef system, comprising thousands of individual reefs and islands. This UNESCO World Heritage site is renowned for its rich biodiversity, housing thousands of marine species, including fish, corals, and sea turtles. The Great Barrier Reef is crucial for ecological balance and attracts millions of tourists each year for activities like snorkeling and scuba diving. It faces significant threats from climate change, pollution, and human activity, prompting conservation efforts.