Gisborne is about 13 times smaller than Warsaw.

Warsaw is approximately 517 sq km, while Gisborne (map shows its 10 named neighbourhoods; the area covers the whole city) is approximately 38 sq km, making Gisborne 7.43% the size of Warsaw.
Tip: This to-scale comparison of Warsaw vs. Gisborne uses the Mercator projection, which distorts the size of regions near the poles.
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