Measured from its easternmost to westernmost points, Australia spans roughly 4,000 km, while the Moon's mean diameter is about 3,474 km, so in purely linear terms the continent is wider than our natural satellite
Main claim
The maximum east–west extent of the Australian continent is commonly cited at around 4,000 kilometres. The Moon’s average diameter is approximately 3,474 kilometres. Comparing these straightforward linear measures shows that Australia’s greatest width exceeds the Moon’s diameter.
How the comparison is made
This comparison uses a single linear measurement for each object: for Australia the maximum continental distance between extreme points on the mainland. For the Moon the mean diameter of its roughly spherical body. Using area or circumference would produce different relationships, but for a simple width‑to‑diameter comparison these commonly quoted figures are appropriate.
Why this seems surprising
The result surprises because apparent size in the sky depends on distance as well as actual size. The Moon appears large to our eyes because it is relatively near, not because it is as big as continents. When numerical dimensions are placed side by side, seemingly counterintuitive comparisons become clear.
Limitations and precision
Both numbers are approximations. Australia’s measured width depends on the exact reference points chosen (for example Cape Byron to Steep Point is one common measure). The Moon’s diameter varies slightly between equatorial and polar measurements, so the mean diameter (~3,474 km) is used for general comparisons.
Conclusion
In summary, based on common linear measurements, Australia’s maximum continental width is larger than the Moon’s mean diameter. It is a neat geographic comparison that highlights how absolute sizes and apparent sizes differ and can challenge everyday intuition about scale.