Santiago Peak is a 6,522-foot mountain in Brewster County, far West Texas, and the highest point in the Santiago Mountains. Rising steeply from the Chihuahuan Desert and visible for many miles, it has strong local relief and ranks eighth in topographic prominence in Texas. The peak is formed of syenite about 35 million years old intruded into older Cretaceous limestone and other sedimentary rocks. It also carries human history: the summit reportedly served as an Apache lookout, campsite remains have been found there, and a local tradition links its name to Santiago, an Indian fighter from Presidio del Norte. Today it remains a striking feature of the Big Bend region.