Located in the southern part of the country, Guangxi is bordered by Yunnan to the west, Guizhou to the north, Hunan to the northeast, and Guangdong to the southeast. It is also bounded by Vietnam in the southwest and the Gulf of Tonkin in the south.

Guangxi is a mountainous region. The Nanling Mountains are found in the northeast border, with the Yuecheng Mountains (越城岭) and Haiyang Mountains (海洋山) being its shorter branching ridges. Nearer to the center of the region are the Dayao Mountains (大瑶山) and the Daming Mountains (大明山). To the north there are the Duyao Mountains (都阳山) and the Fenghuang Mountains (凤凰山), while on the southeast border there are the Yunkai Mountains (云开大山). The highest point is Mount Mao'er (猫儿山) located in the Yuecheng Mountains, at 2141 m.

Many rivers cut valleys through the mountains. Most of these rivers form the tributary basin of the West River:
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