2017 Map of Twomile Lake

About this map

The Coteau des Prairies, a vast glacial plateau, dominates this landscape in Marshall County, creating a complex wetland environment of prairie potholes and interconnected waterways. The region is defined by its series of numbered lakes, including Twomile Lake, Threemile Lake, and Fourmile Lake, which reflect the early surveying and naming conventions of this South Dakota terrain. Significant for local historians, the Fort Sisseton Post Cem stands as a focal point near Mallard Slough and Parsons Pass, grounding the map in the military and settlement history of the late nineteenth-century frontier. The area's drainage and topography are further illustrated by features like Oak Gulch and Clubhouse Slough, while a grid of section lines and county roads, such as Co HWY 12 and Co HWY 14, shows the enduring structure of the rural landscape.