What is required for karst topogragh to form?

Karst topography requires soluble bedrock, typically limestone, gypsum, or salt, which can be dissolved by slightly acidic water. This process is facilitated by rainfall that absorbs carbon dioxide as it moves through soil, forming carbonic acid. Over time, the dissolution of the rock leads to the development of features such as sinkholes, caves, and underground rivers. Additionally, a humid climate with sufficient rainfall accelerates the formation of karst landscapes.