Seoul is about 1.4 times bigger than Wichita.

Wichita (map shows its 73 named neighbourhoods; the area covers the whole city) is approximately 428 sq km, while Seoul is approximately 605 sq km, making Seoul 42% larger than Wichita.
Tip: This to-scale comparison of Wichita vs. Seoul uses the Mercator projection, which distorts the size of regions near the poles.
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