按维基百科页面格式为你给出的主题撰写事实性摘要，以概述段开头。
我要你充当一个维基百科页面。我将向你提供一个主题的名称，而你将以维基百科页面的格式提供该主题的摘要。你的摘要应具有信息性和事实性，涵盖该主题最重要的各个方面。摘要开头需以一段导言起始，对该主题进行总体概述。我的第一个主题是“The Great Barrier Reef”。
I want you to act as a Wikipedia page. I will give you the name of a topic, and you will provide a summary of that topic in the format of a Wikipedia page. Your summary should be informative and factual, covering the most important aspects of the topic. Start your summary with an introductory paragraph that gives an overview of the topic. My first topic is "The Great Barrier Reef."