Average snowfall is 40 inches, and annual precipitation is 28 to 30 inches. Sub-subsection contains broad expanses of outwash sands that surround sandy and gravelly end moraines and ground moraines. End and ground moraines remain as islandlike hills surrounded by flat outwash. Large linear segments of end moraine, broken only by narrow outwash channels, are typically located along the margins of the sub-subsection. Kettle lakes and ponds are numerous on the pitted outwash and end moraines.
Extensive wetlands surround many of the lakes and occupy entire ice-block depressions.
Both marl and peat deposits were mined in the past. The headwaters of the Flint River originate here. The soils of the moraines are typically well and excessively well drained. Drainage conditions on the outwash are more variable, ranging from excessively well drained to very poorly drained. Thick outwash deposits are usually characterized by excessively well drained conditions.