3 sentences

1. 内蒙古是中国的一个自治区。

   nèi Měng gǔ shì Zhōng​guó de yī gè zì​zhì​qū.

   Inner Mongolia is an autonomous region of China.

   Source: Dong Chinese Dictionary

2. 锡林郭勒盟位于内蒙古自治区。

   Xī​lín​guō​lè méng wèi​yú Nèi​měng​gǔ zì​zhì​qū.

   Xilin Gol League is located in the Inner Mongolia Autonomous Region.

   Source: Dong Chinese Dictionary

3. 内蒙古自治区地域辽阔，盛产牛羊。

   Nèi​měng​gǔ zì​zhì​qū dì​yù liáo​kuò, shèng​chǎn niú yáng.

   The Inner Mongolia Autonomous Region is vast and rich in cattle and sheep.

   Source: Dong Chinese Dictionary