data seto japanSeto (, Seto-shi) is a city in Aichi Prefecture, Japan. As of 1 October 2019 , the city had an estimated population of 127,659 in 56,573 households, and a population density of 1,146 persons per km . The total area was 111.40 square kilometres (43.01 sq mi).The Setouchi Triennale is one of the country's foremost contemporary art festivals, held every three years on the islands of the Seto Inland Sea. The 100-day festival, which