Why does Guizhou have steep valleys and deep gorges?

Guizhou’s rugged terrain, characterized by steep valleys and deep gorges, is primarily the result of the province being part of the Yunnan-Guizhou Plateau, an old eroded plateau that has undergone extensive and complicated geological activity.1

The formation of these features is driven by several key factors:

• Geological Processes: The plateau is composed largely of limestone and basalt. The region has experienced significant folding, faulting, and continuous stream erosion, which have collectively carved the landscape into abrupt relief.1
• Karst Topography: In the limestone-rich areas, karst processes have played a major role. These chemical weathering processes have created a landscape defined by precipitous slopes, ravines, sinkholes, and subterranean streams, further contributing to the region's dissected appearance.123
• Topographic Gradient: The entire terrain slopes at a steep angle from the center of the province toward the north, east, and south. This sharp change in gradient, combined with the erosive power of the province's river systems, has incised the landscape, resulting in the deep gorges and steep valleys observed today.14