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Japan comprises over 3,000 islands making it an archipelago. The largest islands are Honshū, Hokkaidō, Kyūshū and Shikoku, together accounting for 97% of Japan's land area. Most of the islands are mountainous, many volcanic; for example, Japan’s highest peak, Mount Fuji, is a volcano. Japan has the world's tenth largest population, with about 128 million people. The Greater Tokyo Area, which includes the de facto capital city of Tokyo and several surrounding prefectures, is the largest metropolitan area in the world, with over 30 million residents.
Archaeological research indicates that people were living on the islands of Japan as early as the Upper Paleolithic period. The first written mention of Japan begins with brief appearances in Chinese history texts from the first century A.D. Influence from the outside world followed by long periods of isolation has characterized Japan's history. Since adopting its constitution in 1947, Japan has maintained a unitary constitutional monarchy with an emperor and an elected parliament, the Diet.
A major economic power, Japan has the world's second largest economy by nominal GDP and the third largest in purchasing power parity. It is a member of the United Nations, G8, OECD and APEC, with the world's fifth largest defense budget. It is also the world's fourth largest exporter and sixth largest importer. It is a developed country with high living standards (8th highest HDI) and a world leader in technology, machinery, and robotics.