To cross over or go across (something); an intransitive verb meaning to traverse or go from one side to the other.
子どもたちが手をつないで池を渡って行った。
The children held hands and crossed the pond.
その橋を渡ると町の中心に出る。
If you cross that bridge, you'll come out in the town center.
横断歩道は必ず歩行者が渡る場所だ。
A crosswalk is a place pedestrians should cross.
夜、川を渡るのは危険だ。
Crossing the river at night is dangerous.
To extend over or cover a range, area, or period (as in 'to span' or 'to cover'); often appears in constructions like '〜にわたって'.
その研究は十年にわたって行われた。
That research was conducted over ten years.
被害は全国にわたって報告された。
Reports of damage came from across the country.
彼の仕事は教育分野にわたっている。
His work spans the field of education.