southwestern mountainous area

基本解释

Mountainous and Grassland landscape and Dong Culture Travel Area in Southwestern Hunan.
湘西南丹霞、山地草原景观和侗文化旅游区。
A magnitude-5.1 earthquake hit a mountainous area in southwestern China on Saturday, killing at least 19 people and injuring 60 as it toppled homes and set off landslides .
星期六，中国西南山区发生5.1级地震，导致房屋倒塌和山体滑波，从而造成至少19人死亡，60人受伤。
blog.sina.com.cn
The newly-built Guiyang-Guangzhou Railway is the first high standard fast-speed railway in the southwestern mountainous area in China, on which a great number of bridges have been built.
新建贵阳至广州铁路是我国西南山区第一条高标准快速铁路，桥梁座数多。