"Sinkholes are most common in what geologists call, 'karst terrain'," the US Geological Survey explains. "These are regions ...

Sinkholes are depressions or holes in the ground caused by the collapse of a surface layer, often occurring in areas known as karst landscapes. These landscapes are characterized by soluble rock ...

Sinkholes are particularly abundant in places with Karst terrain, where the rock below the land surface is soft, eroding over time and eventually giving way, creating these deep underground caverns.

Sinkholes primarily occur in areas known as ‘karst terrain’— landscapes where soluble bedrock, such as limestone or gypsum, can be dissolved by water. Over time, this dissolution process ...

Sinkholes mainly occur in what is known as ‘karst terrain’; areas of land where soluble bedrock (such as limestone or gypsum) can be dissolved by water. With cover-subsidence sinkholes the bedrock ...