Tonto Natural Bridge
Tonto Bridge State Park is located off highway 87 10 miles north of Payson, Arizona.. It is said to be the largest natural travertine bridge in the world. The bridge measures 183 feet high over a 400 foot long tunnel that measures 150 feet at its widest point. Travertine is a rock consisting of calcium carbonate deposited from water-dissolved limestone. For additional information, go to
Photo by Rob Jones
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