This wider view illustrates how natural bridges are formed. The stream that cut White Canyon flowed in large, lazy loops. As the water wore the rock walls between the loops thinner and thinner, it eventually broke through bringing the beginning of the bridge. At this point, the stream changed course sending all the water through the bridge. Over time, the bridge's span becomes larger.
Natural Bridges National Monument
Cedar Mesa, Utah
Part of the Great American West series.
I'll be busy the next few weeks. Commenting will be spotty at best.