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Chiyoda, known as Chiyoda City in English, is a special ward of Tokyo, Japan. Located in the heart of Tokyo's 23 special wards, Chiyoda consists of the Imperial Palace and a surrounding radius of about a kilometer, and is known as the political and financial center of Japan. As of October 2020, the ward has a population of 66,680, and a population density of 5,709 people per km⁲, making it by far the least populated of the special wards. The total area is 11.66 km⁲, of which the Imperial Palace, Hibiya Park, National Museum of Modern Art, and Yasukuni Shrine take up approximately 2.6 km⁲, or 22% of the total area. Chiyoda is known the financial center of Japan; the districts of Otemachi, Marunouchi and Yurakucho east of the palace house the headquarters of 19 Fortune 500 companies, is the source of roughly 10% of the combined revenue of all Japanese companies, and produced the equivalent of around 1/4th of the GDP of the country in 2017. With a day population of around 850,000, its day/night population ratio is by far the highest of all municipalities in Japan. Tokyo Station, Tokyo's main inter-city rail terminal and the busiest train station in Japan in terms of scheduled trains, is also located in Chiyoda. Chiyoda is also the political center of the country. Chiyoda, literally meaning "field of a thousand generations", inherited the name from the Chiyoda Castle, the other name for Edo Castle, which is the site of the present-day Imperial Palace. With the seat of the Emperor in the Imperial Palace at the ward's center, many government institutions, such as the National Diet, the Prime Minister's Official Residence, the Supreme Court, ministries, and agencies are also located in Chiyoda, as are Tokyo landmarks such as Yasukuni Shrine and the Nippon Budokan. Other notable neighborhoods of Chiyoda include Akihabara, Iidabashi and Kanda. The ward was formed in 1947 as a merger of Kanda and Kōjimachi wards following Tokyo City's transformation into Tokyo Metropolis. The modern Chiyoda ward exhibits contrasting Shitamachi and Yamanote geographical and cultural divisions. The Kanda area is in the core of Shitamachi, the original commercial center of Edo-Tokyo. On the other hand, the western part of the Kōjimachi area typically represents a Yamanote district.