In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.

The Great Barrier Reef is the world's largest coral reef system composed of over 2,900 individual reefs and 900 islands stretching for over 2,300 kilometres (1,400 mi) over an area of approximately 344,400 square kilometres (133,000 sq mi). The reef is located in the Coral Sea, off the coast of Queensland, Australia.
is the great barrier reef the biggest reef in the world