What is Australia's longest mountain range?

• A. Blue Mountains
• B. Flinders Ranges
• C. Great Dividing Range
• D. Great Barrier Range

Answer: (C)

The longest mountain system in Australia is the Great Dividing Range, a vast chain that runs along the eastern edge of the continent from the tip of Cape York in Queensland down to the Grampians region in Victoria. It spans roughly 3,500 kilometers, forming a continuous backbone that shapes climate, rainfall, and river systems. The range isn’t a single narrow line; it’s a broad system of mountains, plateaus, and foothills, with many subranges and high points, including the Snowy Mountains where Mount Kosciuszko sits. The Blue Mountains appear as a well-known subrange near Sydney, so they’re part of this larger system but not the entire length. The Flinders Ranges are another, shorter range in South Australia, and there isn’t a major eastern range commonly called the Great Barrier Range—the coastal wildlife area known as the Great Barrier Reef is a different feature.