high ridge separating the San Luis Valley on the west from the watershed of the Arkansas River on the east. Crestones The Crestones are a group of four 14,000+ foot (4,268+ m) peaks (fourteeners) in the Sangre de Cristo Range above Crestone, Colorado. Spanish Peaks The Spanish Peaks are a pair of mountains, West Spanish Peak, , and East Spanish Peak, , located in southwestern Huerfano County, Colorado. The Spanish Peaks were designated a National Natural Landmark in 1976 as one of the best known examples of igneous dikes. The mountains can be seen from as far as to the north from Colorado Springs, to the south from Raton, New Mexico, and to the east from La Junta, Colorado. Culebra Range The Culebra Range runs almost due north and south, with its northern limit at La Veta Pass in Colorado, and its southern limit at Costilla Creek, just south of Big Costilla Peak in New Mexico. Its highest point is Culebra Peak at , which is notable for being the only fourteener in Colorado on private land. Climbers wishing to ascend Culebra must pay a fee (currently US$150 per person), and the number of climbers per year is limited. It is also the most southerly fourteener in the U.S. Rockies. Standing to the east of the main crest are the two prominent Spanish Peaks (West: , East: ). These peaks were important landmarks for 19th century travelers on the mountain branch of the Santa Fe Trail. The western slope of the Culebras and the San Luis Valley are located within the Sangre de Cristo Land Grant, dating back to the 1840s but still a factor in the pattern of land ownership within the grant. The San Luis Valley is arid. The town of San Luis, Colorado has an annual precipitation of only .The surrounding area, traversed by Culebra Creek, has a rich agricultural history and has been the scene of land disputes between the descendants of Hispanic settlers and Anglo ranchers since the 1860s. Taos Mountains The Taos Mountains span the western lobe of the range from Costilla Creek in the north, to Tres Ritos in the south. They include the highest point in New Mexico, Wheeler Peak, at , which is part of the Wheeler Peak Wilderness. Other notable peaks include Pueblo Peak, which at rises dramatically above Taos Pueblo, and Latir Peak, at . Williams Lake is located