Progressing from characters to words and idioms marks advanced Chinese. This guide freely explains 「長江天塹」 for your learning.
Today’s idiom is 「長江天塹」. We’ve outlined its meaning and practical application below.
Trench: trench. The Yangtze River is a natural trench and a dangerous place. In the old days, it was used to describe the Yangtze River as being dangerous and insurmountable.
The Mandarin pronunciation of this idiom is :
zhǎng jiāng tiān qiàn
while its Cantonese pinyin is :
cheung4 gong1 tin1 chim3
The vastness of Chinese idioms, with their many meanings and applications, is inspiring. We hope these resources will guide you in your language-learning adventure.

