一都三県 いっとさんけん Also written 1都3県 Meanings Noun one metropolis and three prefectures (i.e. the Tokyo area: Tokyo, Kanagawa, Chiba and Saitama) Kanji 一 one. Read as イチ. 都 metropolis 三 three. Read as サン. 県 prefecture. Read as ケン. Jinuma: Japanese Dictionary · Word lists