Water reflects as black, grassland as red, and forest as brown.
The dark gray swath through the central portion of the image represents the Red River Valley. The Valley was once the floor of glacial Lake Agassiz. The eastern margin of the Lake Agassiz basin shows as a remarkable compression of shoreline features against high glacial uplands. The western shoreline is obscure, appearing as a series of parallel ridges associated with various levels of the former lake.