
Assumption and Moweaqua anchor this central Illinois landscape, where the agricultural grid is intersected by the winding paths of several creeks. The terrain is defined by the drainage systems of Flat Branch and Big George Branch, which cut across the structured township and range system of the prairie. Smaller waterways like Willow Branch, Oak Branch, and Sorghum Branch reach into the surrounding farmland, illustrating the natural irrigation that supports the region's productivity. In the southern portion of the quadrangle, Lake Fork provides a notable hydrologic feature.
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