The spectacular spine of Badlands National Park is The Wall. This geological backbone is over 200 feet high, is as wide as three miles and stretches for 60 miles. The Wall is the demarcation between the Lower Prairie to the south and the Upper Prairie to the north. The prominent feature of this eroded escarpment is the colorful layers of sedimentary rocks. Like rings in a tree, they reflect millions of years of history. Wall, South Dakota, was named after this beautiful natural phenomenon when the town was incorporated in 1908.