Verb (5-dan, る, intransitive)
1. to cross over; to go across
occ. written as 渉る
あの川は絶対に渡れない。That river absolutely cannot be crossed.
2. to extend; to cover; to range; to span
occ. written as 亘る or 亙る
これは恐らく、何年にも渡って続きます。This will probably go on for years.