Definitions for "Natural Bridge"
Keywords:  arch, span, rockbridge, ahdos, ravine
An arch-shaped rock formation produced by weathering and/or erosion.
An arch-shaped stretch of bedrock remaining in a karst region when the surrounding bedrock has dissolved.
an arch which was formed over a watercourse, and this was not formed in that manner
a system which is no longer functional if any of its parts were removed