Describe the topography in the southernmost quarter of the area. what karst features are present?

More information is needed to fully answer your question. Karst topography is the name given to a landscape dominated by features or land forms that develop on limestone bedrock. Typical limestone topography can be characterized by conical hills with star-shaped valleys known as cockpit karst. The landscape is also usually dominated by dolines or sinkholes. Caves, caverns and disappearing streams with dry valleys are also a characteristic feature.