西日本(にしにほん)

Compound of 西(にし) (west) + 日本(にほん). Roughly contrasts with 東日本(ひがしにほん) (eastern Japan); the exact dividing point varies — weather forecasts, electric utilities (50 Hz vs 60 Hz), and JR companies all draw the line slightly differently.

Common collocations

• 西日本(にしにほん)各地(かくち): places across western Japan
• 西日本(にしにほん)を中心(ちゅうしん)に: centered on western Japan (news phrasing)
• 西日本(にしにほん)豪雨(ごうう): the 2018 'Western Japan Heavy Rain' disaster
• 西日本(にしにほん)出身(しゅっしん): from western Japan

Cultural note

Western and eastern Japan differ in many everyday details: food seasoning (lighter broth in the west), escalator etiquette (stand on the right in Osaka, on the left in Tokyo), and dialect. 西日本(にしにほん) is therefore a useful cultural shorthand, not just a geographic label.

Related words

• 東日本(ひがしにほん): eastern Japan
• 関西(かんさい): Kansai region — narrower; centered on Osaka, Kyoto, Kobe
• 九州(きゅうしゅう): Kyushu — the southwestern main island, part of 西日本(にしにほん)