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city, Mie ken (prefecture), Honshu, Japan. It lies facing Ise Bay, southwest of Nagoya. The city developed around a castle built in 1470. By the Tokugawa period (1603-1867), it had become an important trade centre, with markets open on the fourth day of each month (yokka means "fourth day in the month," and ichi means "market"). The city suffered heavy damage during World War II, but later became the site of a large petrochemical complex. Automobiles, textiles, and chemicals are produced in factories built on reclaimed land. Yokkaichi's growing port imports raw materials and exports its industrial products. The city is considered the nucleus of the Northern Ise Industrial Zone. Pop. (2005) 303,845.