広域

1. Origins, structure, and basic meaning

• Structure: 広域, read こういき, denotes a broad area and can also form a compound before another noun.
• Basic usage: 広域地図 describes the map's regional coverage, while 広域で行う marks the wide area in which an event takes place.

2. Common pitfalls and similar expressions

• Compound 広域地図 versus adverbial 広域で
  • Before 地図 the word forms a compound without の; when it sets the area of an activity, it takes で.