天险

zhè tiáo jiāng kě wèi tiān xiǎn

这条江可谓天险。

This river can be said as a natural barrier.

cǐ shān xiàng yǒu tiān xiǎn zhī chēng

此山向有天险之称。

This mountain has always been considered a natural barrier.

jù shuō nà lǐ shì tiān xiǎn jiā nán dà xuán wō de suǒ zài

据说那里是天险迦南大漩涡的所在。

People say that the area called "Great vortex of Canaan" exists there.