Various landforms of glacial lacustrine origin characterize the subsection, including flat lake bed, deltaic deposits of sand, parabolic dune fields, and shallow embayments containing transverse dunes.
Ground moraine is locally present.
Exposures of limestone and dolomite bedrock occur along the shorelines of both Lakes Michigan and Huron, and locally several miles inland. With a climate typified by lake-effect moderation, this is the warmest subsection in Upper Michigan and northern Wisconsin. Average annual precipitation ranges from 28 to 34 inches. Marie, Michigan, at the extreme northeastern edge. Most of the subsection consists of lacustrine sand or clay deposits that have flat to gently undulating surfaces.