Natural arch
NATURAL ROCK FORMATION WHERE A ROCK ARCH FORMS
Sea arch; Natural bridge; Natural bridges; Pothole arch; Rock arch; Natural rock arch
A natural arch, natural bridge, or (less commonly) rock arch is a natural landform where an arch has formed with an opening underneath. Natural arches commonly form where inland cliffs, coastal cliffs, fins or stacks are subject to erosion from the sea, rivers or weathering (subaerial processes).