Australian Capital Territory is about 1.5 times bigger than London.

London (including the 32 boroughs of greater London) is approximately 1,572 sq km, while Australian Capital Territory is approximately 2,358 km² (910 sq mi), making Australian Capital Territory 50% larger than London.
Tip: This to-scale comparison of London vs. Australian Capital Territory uses the Mercator projection, which distorts the size of regions near the poles.
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