Wellington is about 1.6 times bigger than Geneva.

Geneva (including the canton) is approximately 282 sq km, while Wellington (map shows its 57 named neighbourhoods; the area covers the whole city) is approximately 444 sq km, making Wellington 57% larger than Geneva.
Tip: This to-scale comparison of Geneva vs. Wellington uses the Mercator projection, which distorts the size of regions near the poles.
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