“National border” in Japanese
Short answer
National border in Japanese is “国境” (kunizakai). Full meaning: border (between countries), national border.
Other ways to say “National border” in Japanese
国界
kokkai border (between countries), national border
国境い
kunizakai border (between countries), national border
国ざかい
kunizakai border (between countries), national border
くにざかい
kunizakai border (between countries), national border
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