“〜ni watatte・ni wataru”: Spanning / Across a Whole Range (a broad scope) [JLPT N1]

Content by NTJ Kuma · Nihongo to Japan editorial team · Updated July 27, 2026

「10年にわたって」「多岐にわたる」 — spanning the whole breadth of a period or range (vs にかけて = A-to-B stretch).

「3日間にわたって、会議が続いた」 — stressing the breadth of ‘the whole, spanning'

「今回の交渉は、3日間にわたって続いた」 (this negotiation went on for a full three days) — 「〜にわたって」 means “over the entire range/period of ～, for as long as ～, across ～”: stressing how broad the span or how long the period something covers. It pairs with a length of time (3日間・10年) or spatial range (全国・広範囲). This guide covers 「にわたって」's use and attachment, separating it from the “from ～ to ～” 「にかけて」 (N2).

Core: across the whole ～, for as long as ～ (stressing broad range/period)

「(noun) ＋ にわたって／にわたり」 = “across ～, for as long as ～, over the entire range of ～” — stressing how long the time or how wide the space something spans:

• 工事は半年にわたって行われた (the construction was carried out over half a year).
• 台風の影響は、広い範囲にわたって及んだ (the typhoon's effects reached across a wide area).

Feel: “a full ～／across ～” — the core is “stressing that a range or period is broad, long, covering the whole.” What precedes is a noun of range/period (length of time, region, field, number of times). Modifying a noun uses 「〜にわたる ＋ noun」 (10年にわたる研究 = research spanning 10 years). A formal, written expression (common in news, reports).

Attachment & forms

See it in context

• この橋の工事は、5年にわたって続けられた。(This bridge's construction was continued over five years.)
• 大雨の影響は、県全域にわたって広がった。(The heavy rain's effects spread across the whole prefecture.)
• 彼は3回にわたる手術を乗り越えた。(He got through three surgeries.) — にわたる ＋ noun
• 会議は、多岐にわたる問題を議論した。(The meeting discussed a wide range of issues.)
• 長期間にわたり、ご愛顧いただき感謝します。(Thank you for your patronage over a long period.) — にわたり (written)

⚠️ Common mistakes to avoid

① 「にわたって」 stresses ‘breadth of range/period,' 「にかけて」 stresses ‘the continuum from ～ to ～.' Both relate to range, different feel. にわたって = across／for as long as ～ (stressing ‘the whole range is wide, the period long,' covering all) (3日間にわたって = for a full three days; 全国にわたって = across the whole country); にかけて = from ～ to ～ (stressing ‘a continuous span from one point to another,' fuzzy-bounded) (金曜から日曜にかけて = from Friday through Sunday; see 〈にかけて〉). To stress “a full, across (how long/wide)” use にわたって; for “a stretch from A to B” use にかけて. にわたって precedes one range/period (3日間), にかけて often pairs with 「から」 for between two points (金曜から日曜).

② Modifying a noun uses 「にわたる」, not 「にわたって」. Adverbial (modifying a verb) uses 「にわたって」 (5年にわたって続いた); to modify a following noun use 「にわたる ＋ noun」 (5年にわたる闘病 = a five-year battle with illness; 多岐にわたる分野 = wide-ranging fields). Don't use 「にわたっての」 (△). Check whether a verb or noun follows: verb → にわたって, noun → にわたる.

③ What precedes is a ‘range/period/count' noun, not a general noun. Before 「にわたって」 comes a noun of range, period, count, field (3時間・数年・全域・全分野・3回・広範囲). Not a general, non-range noun. It's specifically for “stressing how long/wide the time/space something spans,” so what precedes must be “a noun you can talk about ‘breadth/length' of.”

🔄 Compare: にわたって／にかけて／を通じて／間

💡 Quick takeaway

「〜にわたって」 = across ～, for as long as ～ (over the entire range/period), its core “stressing how long the time or how wide the space something spans” (3日間にわたって会議; 全国にわたって影響). Three points: ① division of labor with 「にかけて」 — にわたって stresses “the whole range is wide/long” (before one range noun: 3日間), にかけて stresses “the continuum from A to B” (often with から: 金曜から日曜; see 〈にかけて〉); ② modifying a noun uses 「にわたる ＋ noun」 (10年にわたる研究), modifying a verb uses 「にわたって」; ③ what precedes is a range/period/count noun (3時間・全域・3回). A formal, written expression, common in news, reports. To stress “a full, across (how long/wide),” にわたって is the most fitting.

❓ Common questions

Q: 「にわたって」 and 「にかけて」 both relate to range — how do I tell them apart?

Whether it ‘stresses the breadth of the whole range' or ‘a continuum from A to B.' 「〜にわたって」 = across／for as long as ～ (preceded by ‘one range/period noun,' stressing ‘this whole range is wide, this whole period long, covering all'): 調査は10年にわたって行われた (the survey was conducted over ten years — stressing the length of the whole “ten years”); 被害は3県にわたって広がった (the damage spread across three prefectures — stressing breadth). What precedes is one noun of ‘extent' (10年, 3県, 全分野), the point being “a full, across (how long/wide).” 「〜から〜にかけて」 = from ～ to ～ (preceded by ‘から,' marking ‘a continuous span from one point to another,' fuzzy-bounded): 3月から5月にかけて、花が咲く (flowers bloom from March into May — the stretch from March “to” May); 関東から東北にかけて (from Kanto to Tohoku). It stresses “the continuous stretch from A ‘to' B,” usually with a start and end. Test: preceded by ‘one range noun (3日間),' stressing the whole extent → にわたって; preceded by ‘から〜にかけて,' stressing the continuum from A to B → にかけて. E.g., 「3日間にわたって」 (a full three days) vs 「金曜から日曜にかけて」 (the stretch from Friday to Sunday). One “covers the whole range (stressing breadth),” one “from one point to another (stressing continuity).” (にかけて: see 〈にかけて〉.)

Q: How do I tell 「にわたって」 from 「にわたる」?

By whether a verb or noun follows, like the 「〜て／〜る」 difference in other patterns. 「〜にわたって（にわたり）」 = adverbial, modifying a following ‘verb': 工事は3年にわたって続いた (the work continued over three years — 「にわたって」 modifies “continued”); 長年にわたり研究してきた (I've researched over many years — modifies “research”). Before a verb, use 「にわたって／にわたり」. 「〜にわたる」 = attributive, modifying a following ‘noun': 3年にわたる工事 (a three-year ‘construction' — 「にわたる」 modifies the noun “construction”); 広範囲にわたる調査 (a wide-ranging ‘survey'); 多岐にわたる分野 (wide-ranging ‘fields'). Before a noun, use 「にわたる」. Test: before a verb → にわたって／にわたり; before a noun → にわたる. E.g., 「10年にわたって続く」 (continues for ten years, before a verb) vs 「10年にわたる歴史」 (a ten-year history, before a noun). Also, 「にわたり」 is a slightly more written version of 「にわたって」, common in formal documents and speeches (長きにわたり、ありがとうございました = thank you over a long time).

🖊️ Practice Questions (5)

Q1. 「この調査は10年___行われた。」(This survey was conducted over a span of 10 years)

(A) にかけて　(B) にわたって　(C) において　(D) を通じて

Q2. 「台風の被害は関東___九州にかけて広がった。」(Typhoon damage spread from Kanto to Kyushu) Which is the correct usage of にかけて?

(A) the form 「関東から九州にかけて」　(B) 「関東にかけて九州」の形式　(C) どれでも同じ　(D) この文は間違い

Q3. 「彼は音楽・スポーツ・学業と、多岐___活躍している。」(He is active across many fields — music, sports, academics)

(A) にかけて　(B) にわたって　(C) において　(D) にかかわって

Q4. 「にわたって」が強調するものは？

(A) AからBまでの時間（the start point and end point）

(B) 範囲の広さ・規模の大きさ（broad scope / entirety）

(C) 原因と結果

(D) 逆接（〜なのに）

Q5. 「この条約は___にわたる交渉の末、締結された。」(This treaty was concluded after negotiations spanning a long 〜) 空欄に最も適切なのは？

(A) 短期　(B) 一時的　(C) 長期　(D) 即時

Answer Explanations

1. (B) にわたって ── 「10年にわたって」(over a span of 10 years), 「行われた」(was conducted) = emphasizing the breadth of time → にわたって.

2. (A) ── The correct form of にかけて is 「AからBにかけて」(the range from A to B), which requires the combination of 「から」 and 「にかけて」.

3. (B) にわたって ── 「多岐にわたって」(across many diverse fields), 「活躍している」= a wide range covering many aspects → にわたって (多岐にわたって = a fixed collocation).

4. (B) ── にわたって emphasizes "the breadth of the range / the scale," with a nuance that "this impact/activity covers that entire range."

5. (C) 長期 ── 「長期にわたる交渉」(negotiations spanning a long time) = a common fixed collocation, emphasizing the breadth of time.