The bog communities of Illinois are found almost exclusively in glaciated depressions of the northeast corner of the state. Drainage is usually restricted, and this, coupled with an abundance of sphagnum moss, results in conditions which are highly acidic.

The soils of a bog are saturated throughout the growing season in most years, and small open water areas are common. Vegetation consists of a variety of emergents with shrubs and/or small trees occurring on more consolidated peat.  Soils acidity and low nutrient levels inhibit the invasion of competing species. No specific classification code exists for these areas so therefore the wetland maps cannot be used exclusively to locate bogs.  However, the saturated water regime (B) will provide a clue to the presence of a bog, since this regime was used most commonly in describing these areas.  

The soils in this community consist of organic materials.  The principal soil is Houghton peat.  Other associated organic soils which are not highly acidic are Houghton muck, Aurelius muck, and Muskego muck.

*Used throughout the community descriptions to indicate the most commonly occurring code in Illinois