Valley View Glades Natural Area is in central Jefferson County. The 225-acre Valley View Glades area is part of a large complex of glades starting just east of the Big River, near Morse Mill and extending eastward and beyond Hillsboro and Desoto, to Festus, then south into Ste. Genevieve County. This large complex of glades occurs in a band two to five miles wide. These glades are principally on Jefferson City-Cotter dolomite of Ordivician age.