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data japanSummary statistics; Region: 2015: Eastern Asia : Surface area (sq km) 2014: 377930: Data refer to 1 October 2007. Population (proj., 000) 2016: 126324 : Pop. density (perJapan is a hhly developed market economy and one of the most affluent countries in the world. In 2025, it had the fourth-largest GDP worldwide. With a population of around