3 sentences for 境内 (jìng​nèi — within borders)

1. 中国境内居住着许多少数民族。

   Zhōng​guó jìng​nèi jū​zhù zhe xǔ​duō shǎo​shù​mín​zú.

   Many ethnic minorities live within China's borders.

   Source: Dong Chinese Dictionary

2. 这条河流经我国境内，最终注入大海。

   zhè tiáo hé​liú jīng wǒ guó jìng​nèi, zuì​zhōng zhù​rù dà​hǎi.

   This river flows through our country and eventually empties into the sea.

   Source: Dong Chinese Dictionary

3. 北京猿人是中国境内发现的一种重要古人。

   Běi​jīng yuán​rén shì Zhōng​guó jìng​nèi fā​xiàn de yī zhǒng zhòng​yào gǔ​rén.

   Peking Man is an important ancient human discovered in China.

   Source: Dong Chinese Dictionary