Grammar › N2 · 11 Formal and written style
〜にわたって: over; throughout
N2 · 11 Formal and written style
Says something covers a long time or a wide area.
Noun of time/range + にわたって. Often with numbers: 三日間にわたって. Written style. The noun form is 〜にわたる. It stresses the long span, not a single point.
Examples
会議は三日間にわたって行われた。
The meeting was held over three days.
台風の被害は、広い地域にわたっている。
The typhoon damage extends over a wide area.