境内 jìngnèi within the borders
within the borders; internal (to a country, province, city etc); domestic
How to remember 境内: 境 boundary + 内 inside = within the borders.
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How it is used
- Within (a country's/region's) borders / domestic - 中国境内 (Zhōngguó jìngnèi) inside China; 境内旅游 (jìngnèi lǚyóu) domestic travel.
- Opposite of 境外 (jìngwài, outside the borders/overseas). Formal, common in official and financial contexts - 境外旅游 (jìngwài lǚyóu) travel abroad.