広範囲, こうはんい
NA-adjective
extensive, vast range, wide scope
彼の研究は広範囲に及んでいる。
に
Particle
1. at (place, time), in, on, during
2. to (direction, state), toward, into
3. for (purpose)
4. because of (reason), with
5. by, from
わたる, 渡る
Conjugated: わたった
Godan verb, Intransitive, occ. written as 渉る
1. to cross over, to go across
See にわたって, Usually in kana, occ. written as 亘る or 亙る
2. to extend, to cover, to range, to span
橋は安全です。車でわたれます。