We found one dictionary that defines the word national boundary:

General (1 matching dictionary)

1. National boundary: Wikipedia, the Free Encyclopedia

Types: land border, maritime border, airspace, more... ▸ Words similar to national boundary ▸ Usage examples for national boundary ▸ Idioms related to national boundary ▸ Wikipedia articles (New!) ▸ Words that often appear near national boundary ▸ Rhymes of national boundary ▸ Invented words related to national boundary