Australian Citizenship Practice Exam 2025 - Free Citizenship Practice Questions and Study Guide

The Great Barrier Reef is a significant natural feature located in Australia, renowned for its stunning coral formations and rich biodiversity. It is the largest coral reef system in the world, stretching over 2,300 kilometers along the northeastern coast of Australia. This remarkable natural wonder is not only a UNESCO World Heritage Site but also plays a crucial role in supporting a diverse marine ecosystem, making it a vital area for both ecological research and tourism.

The other options presented are notable natural features in their own right but do not pertain to Australia. The Amazon Rainforest is primarily located in South America and is known for its vast biodiversity and essential role in the earth's climate. The Sahara Desert is the world's largest hot desert, predominantly in North Africa, while the Rocky Mountains are a major mountain range in North America. Each of these features is significant globally, but none are found within Australia’s geographical boundaries. Thus, the Great Barrier Reef stands out as a uniquely Australian natural marvel.