data seto japanSeto, city, Aichi ken (prefecture), central Honshu, Japan, northeast of Nagoya. Seto, established about 1230, is known for its porcelain (Seto ware). Since the Meiji period (1868–1912),Located 25 kilometres northeast of Nagoya in the low mountains of the Owari Hills, Seto is most well-known as one of the Nihon Rokkoyo.