noun, noun or participle which takes 'suru', intransitive verb
illegal border crossing; border violation
Refers to crossing a national border without authorization, often in legal or news contexts. Can be used as a noun or with する to describe the act.
密入国者は夜中に越境を試みた。
The illegal immigrant attempted to cross the border at night.
彼はパスポートなしで越境し
He crossed the border without a passport.