国界 (guó jiè) — national border; national boundary

Definition

Examples

• 这条河是两国的国界。
  Zhè tiáo hé shì liǎng guó de guó jiè.
  This river is the border between the two countries.
• 两国在国界问题上存在争议。
  Liǎng guó zài guó jiè wèn tí shàng cún zài zhēng yì.
  The two countries have disputes over the border issue.
• 军队守卫着国家的国界。
  Jūn duì shǒu wèi zhe guó jiā de guó jiè.
  The army guards the national border.