know abt Tokyo ?

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Tokyo as an administrative region, known as Tokyo-to ??? or "Tokyo Metropolis", is one of 47 prefectures of Japan and is not administered as a single city. It consists of twenty-three central "special wards" (which were administered as Tokyo City until 1943, although no such city exists de jure) and many suburban cities. About 12 million people (10 percent of Japan's population) live within Tokyo-to's prefectural boundaries. About 35 million people live in the Greater Tokyo Area which encompasses Tokyo-to and surrounding prefectures, making it the world's most populous metropolitan area. Because of its huge population and wealth, many world records are or were held here, including the most expensive real estate ever ($1.5 million/sq meter in 1990), the most expensive city for over a decade running, the most passengers served by its train system, and has the largest GDP of any metropolitan area in the world. It is considered one of the world's major global cities and a megacity. The word "Tokyo" may refer to Tokyo-to as a whole, or only to the main urban mass under its jurisdiction (thus excluding west Tama and Izu / Ogasawara Islands), or even the whole of Greater Tokyo Area, depending on context. This article refers to Tokyo-to unless otherwise stated.