日本中(にほんじゅう)

The suffix 〜中(じゅう) attaches to place words to mean "throughout" or "all over."

Common collocations

• 日本中(にほんじゅう)を旅(たび)する: to travel all over Japan
• 日本中(にほんじゅう)に広(ひろ)まる: to spread throughout Japan
• 世界中(せかいじゅう): all over the world (same 〜中(じゅう) pattern)

Note on reading

With place words 〜中(じゅう) is read じゅう (extent across space); the same kanji read 〜中(ちゅう) marks an ongoing action or period (会議中(かいぎちゅう) "in a meeting").