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The 'Tōkai region' (東海, literally ''East Sea'') is a subregion of Chūbu, Kantō and Kansai, Japan along the Pacific Ocean. The name comes from Tōkaidō, one of the Edo Five Routes.
The prefectures consisting the Tōkai region are unfixed.
From the geographic point of view, they are Shizuoka, Aichi, 'Mie' (Kansai region,関西地方) and the southern part of Gifu, but, there is a case including 'Tokyo and Yokohama' (Kantō region,関東地方) in Tōkai region.
The economic tie between 'Aichi, Gifu and Mie' (Chūkyō region,中京地方) is considerably strong.
'Kantō region'（関東地方）
'Chūbu region'（中部地方）
'Kansai region'（関西地方）