一いっ都と三さん県けん

noun

Tokyo and three surrounding prefectures

Refers to the greater Tokyo area: Tokyo, Kanagawa, Chiba, and Saitama. Often used in news, statistics, and regional planning contexts.

• 一いっ都と三さん県けんで緊きん急きゅう事じ態たい宣せん言げんが発はつ令れいされた。

  A state of emergency was declared in Tokyo and the three surrounding prefectures.

• 一いっ都と三さん県けんの人じん口こうは日本にほんの約やく3割わりを占しめる。

  The population of Tokyo and the three neighboring prefectures accounts for about 30% of Japan's total.