Natural arch
A natural arch is a natural rock formation where an arch has formed with an opening under the arch. It is also called a natural bridge, or (less commonly) rock arch. Natural arches commonly form where inland cliffs, coastal cliffs, fins or stacks are eroded by the sea, rivers or weathering.
Most natural arches are formed from narrow fins and sea stacks that is made up of sandstone or limestone.
Natural Arch Media
Delicate Arch in Arches National Park, Utah, United States
The Great Arch, Tabuk Province, Saudi Arabia
The Azure Window, Malta, before it collapsed in 2017
Darwin's Arch, Galápagos Islands, Ecuador, before it collapsed in 2021
Metate Arch, Devils Garden (GSENM), a very thin arch near the end of its life
A topographic map of Coyote Natural Bridge in Utah shows how the meandering Coyote Gulch carved a shorter route through the rock under the arch. The old riverbed is now higher than the present water level.
London Bridge, Victoria, Australia, before its partial collapse in 1990
Natural arches in the La Cathedrale formation of Tadrart Rouge range, Algeria
South Africa Coffee Bay
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