About 20 miles north of Fredericksburg in the Texas Hill Country, a huge pinkish rock protrudes up out of the earth that magically draws visitors to it. Enchanted Rock is a Texas state natural area on more than 1600 acres along the Big Sandy. The rock itself covers 640 acres and rises 425 feet above the surrounding topography. At about a billion years old, it’s one of the oldest exposed rocks on the continent.