Website : http://www.city.sayama.saitama.jp/
As part of an afforestation project around Hallyeosudo Waterway, on July 4, 1973, the city Tongyeong signed a sister city agreement with the city of Saitama which is one of the major tea producing areas in Japan. Since then, the two cities have been carrying out cultural exchange programs for youth groups, social organizations and administrative training programs for public officials every year.