给出一段英语文本并让GPT模型生成一个包含5个以上句子的摘要，概括文本内容。
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. This reef structure is composed of and built by billions of tiny organisms, known as coral polyps. It is home to an extremely diverse array of sea life. It was selected as a World Heritage Site in 1981 and is a highly sought-after destination for tourists from around the world.
The Great Barrier Reef is a coral reef system located off the coast of Queensland, Australia. It stretches for over 2,300 kilometers and is composed of thousands of individual reefs and islands. The reef structure is built by coral polyps and is home to an incredibly diverse range of sea life. It was designated as a World Heritage Site in 1981 and is a popular tourist destination.