The Great Barrier Reef is located in Australia. It stretches over 2,300 kilometers along the northeastern coast of the country, primarily in the state of Queensland.

The reef is considered one of the most biodiverse ecosystems in the world, housing thousands of species of marine life, including corals, fish, turtles, dolphins, and sharks. It is also a UNESCO World Heritage site and a popular tourist destination, attracting millions of visitors each year.

For example, the Great Barrier Reef Marine Park, established in 1975, covers an area of approximately 344,000 square kilometers and is managed by the Australian government. The park implements various conservation measures to protect the reef's fragile ecosystem.

References:

1. Great Barrier Reef Marine Park Authority
2. Tourism Australia - Guide to the Great Barrier Reef