“〜ni watatte・ni wataru”: Spanning / Across (a whole range or period) [JLPT N2]

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

“Zenkoku ni watatte chōsa shita” “San-nen ni wataru kenkyū” — covering an entire span

「調査は全国にわたって行われた」 — over the whole stretch, comprehensively

News often reads: 「今回の調査は、全国にわたって行われた」 (this survey was conducted across the whole country) — 「〜にわたって・〜にわたる」 = comprehensively over a ～ range／period, meaning something unfolds “over the whole stretch, comprehensively” across a period of time or a range (how long, how wide). This guide covers its “covering the whole range” feel, the attributive 「にわたる,」 the 「AからBにわたって」 use, and how to tell it from 「を通じて.」

Core: stressing the vastness of range/length of time (comprehensive coverage)

「(period/range) noun ＋ にわたって」 means “something unfolds comprehensively, entirely, over a period of time or a range”:

• time: 会議は5時間にわたって続いた (the meeting lasted for five whole hours).
• space/range: 調査は全国にわたって行われた (the survey was conducted across the whole country).
• items: 試験は5科目にわたる (the exam spans five subjects).

Feel: “comprehensively over a ～ range/period” — the core is stressing the vastness of range, the length of time: it treats a period (3年, 長年, 5時間) or a space/field (全国, 広範囲, 多方面) as “one whole stretch/expanse,” stressing that something covers, spans the entire range, with the sense of “vast in scale, comprehensive coverage.” To modify a noun, use 「にわたる ＋ noun」 (長年にわたる研究).

Forms & attachment

See it in context

• 彼はプロ野球選手として、20年にわたって活躍した。(As a pro baseball player, he was active for twenty years.)
• 台風の影響は、広範囲にわたって及んだ。(The typhoon's impact reached over a wide area.)
• 三日間にわたる話し合いの末、合意に達した。(After three days of discussion, an agreement was reached.)
• 被害は、関東から東北にわたって広がった。(The damage spread from Kanto to Tohoku.)
• 会議では、多岐にわたる議題が話し合われた。(At the meeting, wide-ranging topics were discussed.)

⚠️ Easy traps to avoid

① Precedes a ‘period or range' noun, stressing ‘comprehensive coverage.' The first clause of 「にわたって」 is always a period or range noun — time (3年・長年・5時間・数か月), space (全国・広範囲・世界各地), items/fields (5科目・多方面・多岐). It means “unfolding comprehensively, entirely, over this whole stretch of time/expanse of range,” stressing the vastness of range, the length of time: 全国にわたって (across the whole country — wide in space), 20年にわたって (for twenty years — long in time), 多方面にわたって (over many areas — wide in field). So it foregrounds the scale of “covering, spanning the entire range.” Test: is the preceding “a period or a range (3年/全国/5科目…),” wanting to stress “comprehensive coverage, large scale”? Yes → にわたって applies. (If the preceding isn't a period/range, don't use にわたって.)

② To modify a noun use 「にわたる」 (not にわたって). This is a frequently-tested attachment trap. To modify a noun, use the attributive 「にわたる」 (not 「にわたって」): ○ 長年にわたる研究 (research spanning many years — modifies the noun 「研究」), ○ 10年にわたる調査 (a ten-year survey), ○ 広範囲にわたる被害 (damage over a wide area) / × 長年にわたって研究(が…) (when modifying a noun, use にわたる). For a verb clause, use 「にわたって」: ○ 5時間にわたって続いた (lasted five hours — modifies the verb 「続いた」). Test: a noun follows (研究・調査・被害) → 「にわたる」; a verb clause follows (続いた・行われた) → 「にわたって.」 Mnemonic: modify a noun → にわたる, modify a verb → にわたって.

③ 「にわたって」 vs 「を通じて」: comprehensive coverage of a range vs the whole period/through. Both can express “over a ～ period,” but with different emphases. 「〜にわたって」 = comprehensively over a ～ range/period (stressing vastness of range, comprehensive coverage): stresses “spanning, covering the entire (large) range/long period,” with a sense of scale: 全国にわたって調査した (surveyed across the whole country — stressing wide range), 3年にわたって続いた (lasted three whole years — stressing long time). It foregrounds “the ‘breadth, length' of the range/time.” 「〜を通じて」 = throughout the whole ～ period (from start to end)／through ～ (a means): ① for a whole period (throughout, all the way): 一年を通じて温暖だ (warm all year round — persisting the whole period); ② for a means/medium: 友人を通じて知り合った (met through a friend — a medium). Difference: 「にわたって」 stresses “the ‘vastness, length' of the range/time (comprehensive coverage)” (scale); 「を通じて」 (for a period) stresses “throughout the whole period, from start to end” (persisting, running through), or “through a medium.” Test: to stress “spanning, covering the whole large range/long period (scale)” → にわたって; to say “throughout the whole period, from start to end” or “through ～” → を通じて. Also, 「〜にかけて」 is “from A to B, this stretch” (春から夏にかけて = from spring to summer), leaning “a certain stretch,” different from 「にわたって (comprehensively over the whole range).」

🔄 Compare with similar forms: にわたって／を通じて／にかけて／の間

💡 Learning tip

「〜にわたって・にわたる」 = comprehensively over a ～ range/period (covering the whole range, stressing vastness of range/length of time) — three points: ① precedes a period/range noun — 3年・全国・5科目・広範囲, stressing the scale of “spanning, covering the entire range”; ② to modify a noun use 「にわたる」 (長年にわたる研究, a frequently-tested attachment trap), for a verb clause use 「にわたって」; ③ division of labor with 「を通じて」 — にわたって stresses “the vastness/length of range/time, comprehensive coverage” (scale), を通じて marks “throughout the whole period” or “through ～.” Often paired with 「から」 as 「AからBにわたって」 marking both ends (関東から東北にわたって). This pattern is high-frequency in news and reports for large-scale surveys, long-term research, widespread damage — 「全国にわたって」「長年にわたる」 instantly foreground “vast scale, comprehensive coverage.”

❓ Quick FAQ

Q: How do I use 「にわたって」 and 「にわたる」? What's the difference?

The difference is whether a noun or a verb follows: modify a noun use 「にわたる」 (attributive), modify a verb/clause use 「にわたって」 (adverbial). This is a frequently-tested attachment trap for 「にわたって.」 「〜にわたって」 is the adverbial form, followed by a verb/clause: 会議は5時間にわたって続いた (the meeting lasted five hours — modifies the verb 「続いた」), 調査は全国にわたって行われた (the survey was conducted across the country — modifies the verb 「行われた」), 被害は広範囲にわたって及んだ (the damage reached over a wide area — modifies the verb 「及んだ」). A verb/clause follows. 「〜にわたる」 is the attributive form, followed by a noun: 長年にわたる研究 (research spanning many years — modifies the noun 「研究」), 10年にわたる調査 (a ten-year survey — modifies the noun 「調査」), 広範囲にわたる被害 (damage over a wide area — modifies the noun 「被害」), 多岐にわたる議題 (wide-ranging topics). A noun follows. The test is dead simple: see whether a noun or a verb follows — a verb/clause (続いた・行われた・及んだ) → にわたって; a noun (研究・調査・被害・議題) → にわたる. This is Japanese's “連用 (て) modifies verbs, 連体 (る) modifies nouns” rule. A common error is still using にわたって to modify a noun (× 長年にわたって研究 → ○ 長年にわたる研究). Remember “modify a noun → にわたる, modify a verb → にわたって” and you won't fall into this trap. (Also, 「にわたり」 is the written abbreviation of 「にわたって.」)

Q: 「にわたって」 and 「を通じて」 both express ‘over a ～ period' — how do I tell them apart?

Different emphases: 「にわたって」 stresses “the vastness/length of range/time, comprehensive coverage,” 「を通じて」 (for a period) stresses “throughout the whole period, from start to end.” 「〜にわたって」 = comprehensively over a ～ range/period (stressing vastness of range, length of time, covering the whole large range): it treats a large range or long period as “one whole stretch/expanse,” stressing that something spans, covers the entire range, with a sense of scale: 3年にわたって交渉が続いた (negotiations continued for three whole years — stressing the length of “three years”), 全国にわたって被害が出た (damage occurred across the whole country — stressing the breadth of “nationwide”), 多方面にわたって影響した (affected many areas — wide range). It foregrounds “the ‘breadth, length, scale' of range/time.” 「〜を通じて」 = throughout the whole ～ period (start to end)／through ～: ① for a whole period, stressing “throughout (the entire period), all the way, continuously”: 一年を通じて (all year round), 生涯を通じて (over one's whole life), この期間を通じて (throughout this whole period); e.g. 北海道は一年を通じて涼しい (Hokkaido is cool all year round). ② also for a means/medium: 友人を通じて (through a friend), メディアを通じて (through the media). Difference: 「にわたって」 stresses “the ‘vastness, breadth, length' of range/time (covering the whole range, a sense of scale)”; 「を通じて」 (for a period) stresses “throughout the whole period, from start to end, consistently” (persisting, running through). Test: to stress “spanning, covering the whole large range/long period (vast scale)” → にわたって (全国にわたって, 10年にわたって); to say “throughout the whole period, from start to end” → を通じて (一年を通じて); to say “through a medium” → を通じて (友人を通じて). E.g. 「10年にわたって研究した (researched for ten whole years — stressing the length, scale)」 uses にわたって; 「一年を通じて観光客が多い (tourists are many all year round — throughout the whole period)」 uses を通じて. One stresses “the vastness of range/time,” one stresses “throughout the whole period.”

🖊️ Practice Questions (5)

Q1. 「会議は5時間___続いた。」（lasted for 5 hours）

(A) にわたって　(B) において　(C) にとって　(D) によって

Q2. 「長年___研究」（research spanning many years） Which form modifies the noun?

(A) にわたる　(B) にわたって　(C) にわたり　(D) にわたるの

Q3. 「広範囲にわたって被害が出た」の意味は?

(A) The damage spread over a wide area

(B) Only a small area was damaged

(C) There was no disaster

(D) The extent is unknown

Q4. 「にわたって」が前接するのは?

(A) A noun of duration/scope (3年・全国・5科目)

(B) An emotion adjective

(C) An interrogative

(D) A verb て-form

Q5. 接法が正しいのは?

(A) 10年にわたる調査。　(B) 10年をにわたって。

(C) 10年がわたって。　(D) 10年にわたるをして。

Answer Explanations

1. (A) にわたって ── Lasted 5 hours.

2. (A) にわたる ── Use にわたる to modify a noun.

3. (A) ── The damage spread over a wide area.

4. (A) ── Preceded by a noun of duration/scope.

5. (A) ── 「10年にわたる調査」 is correct.