Great Swamp covers a total land area of 3349 acres. Acreage is divided among the following cover types: wetlands (2262 acres), forest cover (897 acres), agricultural land (88 acres), and other lands (102 acres; brush, utilities, etc.). The area contains extensive forested freshwater wetlands, dominated by red maple swamps with some cedar swamp. The Great Swamp Impoundment is a created marsh covering approximately 138 acres. This wetland provides a diversity of wetland cover types including deep and shallow marsh, vegetated and nonvegetated open water, aquatic shrubs and shrub swamp. The diversity of habitats provides an excellent mosaic of cover types for a great number of migratory waterfowl. The DFW actively manages 2.6% (88 acres) of the property as agricultural land to create food plots and other plantings for wildlife. Great Swamp borders the entire northern end of Worden Pond, controlling over 2 miles of pristine shoreline habitat. Additionally, several main tributaries to the Pawcatuck River flow through the area including the Chickasheen Brook, the Usquepaug River, the Chipuxet River, and the Charles River.