The southeastern part of Utah is overlaid with strata of red and yellow sandstone hundreds of feet deep. Ages ago this whole region was elevated and thereby was distorted by the internal forces which pushed it upward. Subsequently wonderful transformations were wrought. The flowing streams gradually bored through portions of the soft, uplifted sandstone, forming arches and digging deep canyons, while the air and rain rounded off the rugged parts into graceful shapes. Wonderful as is the famous Natural Bridge of Virginia, the natural bridges of Utah are still more wonderful. In White Canyon of southeastern Utah are Edwin, Carolyn, and Augusta Bridges--magnificent structures of pink sandstone carved in lines of classic symmetry and possessing gigantic proportions. At least half a dozen natural bridges in Utah surpass that of Virginia, not only in beauty and grandeur, but also in dimensions. They were discovered by cattlemen in 1895, but they did not become known to the outside world until 1909, when the region was explored by the Utah Archaeological Expedition. [Illustration: Witch Rocks, near Echo Canyon, Utah] Of these bridges the Edwin easily ranks first in graceful symmetry; its span is one hundred and ninety-four feet, its elevation one hundred and eight feet, its width thirty-five feet. Combining grace and massiveness, the Augusta stands pre-eminent. It rises in majestic proportions to the height of two hundred and twenty-two feet and has a span between abutments of two hundred and sixteen feet. The width of the road-bed is twenty-eight feet and the thickness of the arch at the keystone is forty-five feet. The height of the Carolyn Bridge is two hundred and five feet and the span one hundred and eighty-six feet. All these bridges span canyons whose depths correspond to the height of the arched structures. In White Canyon, a few miles below Edwin Bridge, under its overhanging rock walls, are the ruins of numerous cliff-dwellings. The largest natural bridge in the world yet discovered is the Nonnezoshi. It is in Nonnezoshiboko Canyon, Utah, not far from the place where the San Juan River enters the Colorado. This mammoth arch is more of a flying buttress spanning the canyon than a real bridge. Its height is three hundred and eight feet and its span two hundred and eighty-five feet. To visit these bridges from the nearest railway station requires stage and horseback riding for upward of one hundred and twenty-five miles. The latter part of the journey is made over a faint trail through a rugged country; but the scenery amply repays one for the hardships endured. The climatic changes during the ages have been such that this region is now almost inaccessible on account of the lack of water, except in the early spring when melting snows yield a temporary supply. Even the cattlemen pasturing their herds in that section keep them there but a few weeks during the year, so scarce is both water and vegetation.