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city, Saitama ken (prefecture), Honshu, Japan. Ageo lies on the terrace between the Ara River (west) and the Ayase River (east). A former post town between Tokyo and Maebashi, it was connected to Tokyo (25 miles [40 km] southeast) in 1883. Ageo remained the market centre of the neighbouring agricultural region until 1955, when machinery, rubber, and metallurgy industries were developed in the city. Pop. (2005) 220,232.