southwestern mountainous area

基本解释

Mountainous and Grassland landscape and Dong Culture Travel Area in Southwestern Hunan.
湘西南丹霞、山地草原景觀和侗文化旅遊區。
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，中國西南山區發生5.1級地震，導致房屋倒塌和山躰滑波，從而造成至少19人死亡，60人受傷。
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.
新建貴陽至廣州鉄路是我國西南山區第一條高標準快速鉄路，橋梁座數多。