3 sentences

1. 这里的山势岭巆，极其险峻。

   zhè​lǐ de shān​shì lǐng​hóng, jí​qí xiǎn​jùn.

   The mountains here are high and extremely steep.

   Source: Dong Chinese Dictionary

2. 华山以其险峻而闻名于世。

   Huà Shān yǐ qí xiǎn​jùn ér wén​míng yú shì.

   Mount Hua is world-famous for its precipitous cliffs.

   Source: Dong Chinese Dictionary

3. 探险队终于成功登上了那座险峻的雪峰。

   tàn​xiǎn​duì zhōng​yú chéng​gōng dēng​shàng le nà zuò xiǎn​jùn de xuě​fēng.

   The expedition team finally successfully climbed that steep snowy peak.

   Source: Dong Chinese Dictionary