Several types of wetland communities occur at Midewin, distributed across the landscape in depressions and low areas. They include seeps or springs, sedge meadows, and marshes. Some of these wetlands are permanently wet, whereas others are only seasonally wet such as shallow potholes. Prairie potholes are extremely important to the waterfowl that depend upon them for food and resting places during migration. Marshes occur as part of an integrated complex of wet prairie, marsh, and sedge meadow.
Sedge meadows are some of the most beautiful wetlands on the prairie.