This means something happens across a whole area. It can also mean it happens for a long time. It shows a large scale.
Noun + にわたりPrimary
Noun + にわたる + Noun
This means something happens across a whole area. It can also mean it happens for a long time. It shows a large scale.
会議は３日間にわたり行われました。
The conference was held over a period of three days.
１０年間にわたる研究の末、ついに新薬が開発された。
After ten years of research, a new drug was finally developed.
災害の影響は、幸いにも全国にわたることはなかった。
Fortunately, the effects of the disaster did not extend nationwide.
その改革は教育から経済まで、多岐にわたる。
That reform is wide-ranging, from education to the economy.
明日から１週間にわたり、システムメンテナンスを実施いたします。
Starting tomorrow, we will be conducting system maintenance for one week.
This grammar sounds a bit more formal. It is like using fancier words in English. You might see it in books or official papers. It often describes something that covers a very large area or a very long time.
This is more formal than 〜にわたって. You use it in writing or speeches. 〜中 means 'during' something. 〜から〜にかけて shows a range, but not always the whole time.
Don't use this when talking about a single moment. For example, you can't say "at 3 PM" with this grammar.
Contrasts with(2)
More formal alternatives(3)
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