Ancient peneplained surface is dissected by irregular steep sided valleys.

古准平原化地形被不规则的峻峭的山谷所切割。

youdao

We drove up a steep-sided valley.

我们把车开上了陡峭的峡谷。

《柯林斯英汉双解大词典》

In the rusty red deserts of South Africa, steep-sided rocky hills called inselbergs rear up from the plains like the bones of the earth.

在南非铁锈般红色的沙漠中，被称为岛山的陡峭岩石山丘从平原上拔地而起，就像大地之骨。

youdao

There are 36 domed rocks shoulder to shoulder forming deep valleys and steep-sided gorges.

BBC: Lonely Planet's top 10 in Australia's Northern Territory

Mr Smith fell out of his canoe as he navigated his way down a steep-sided gorge.

BBC: Tribute to 'brilliant' canoeist Dave Smith

We set off from Sankri on a wide, stone-paved track that ran north into a steep-sided valley.

WSJ: Trekking the Har Ki Doon Trail in India's Himalayas