also: にしにっぽん
noun
western Japan; West Japan
A broad regional term, usually referring to the Chūbu region and areas farther west. The exact boundary can vary by context.
See also: 東日本
西日本では、夏から秋にかけて台風の影響を受けやすい。
Western Japan is likely to be affected by typhoons from summer through autumn.
出張で西日本を一週間かけて回った。
I spent a week traveling around western Japan on a business trip.