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Municipal land area in km². A base value for derived metrics (population density, etc.) — larger is not better on its own.
Source: GSI — Survey of Land Area by Prefecture and Municipality
▲ The top 5 prefectures are tinted sky, ▼ the bottom 5 amber — just enough colour to follow the two ends of the “desirable direction.”
To see the same metric on the map, pick it from the map on the home page.