data seto japanHow many travelers visit Japan? Visitor Arrivals provides fures trend of foren nationals traveling to Japan by year, month and the purpose of visit. A breakdown by countryarea isSeto (, 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).