Correction for the size of Christchurch
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How big is 521,000,000,000 circular inches?
It's about two-fifths as big as Christchurch
The size of Christchurch is about 1,200,000,000,000 circular inches.
(a.k.a Ōtautahi) (urban area) (New Zealand)
Ōtautahi Christchurch, New Zealand's gateway to Antarctica, measures 1,200,000,000,000 circular inches in total area.