Final answer:
The Great Barrier Reef is approximately 2,300 kilometers long and covers an area of about 344,400 square kilometers.
Step-by-step explanation:
The length of the Great Barrier Reef is approximately 2,300 kilometers (1,400 miles) long, making it the largest coral reef system in the world. It stretches along the northeastern coast of Australia, from the state of Queensland to the Torres Strait. The reef is composed of over 2,900 individual reefs and covers an area of about 344,400 square kilometers (133,000 square miles).
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