The Great Barrier Reef, located off the coast of Australia, is not just the world's largest coral reef system; it's also visible from outer space, making it one of Earth's most remarkable natural wonders. Stretching over 2,300 kilometers (1,400 miles), it comprises thousands of individual reefs and hundreds of islands. What's even more fascinating is that the reef is home to an incredibly diverse array of marine life, including over 1,500 species of fish, 400 types of coral, and various other creatures like turtles, dolphins, and sharks. Its sheer size and biodiversity make it a truly awe-inspiring spectacle of nature.