NATURAL BRIDGE

Natural bridge or Natural Bridge can refer to several things:Natural arch, a land formation sometimes referred to as a natural bridgeNatural Bridge, Queensland, in the Gold Coast hinterland, AustraliaNatural Bridge (Virginia), a National Historical Landmark in the U.S. state of VirginiaNatural Bridge Caverns, in the U.S. state of TexasNatural Bridge State Park (Kentucky), in the U.S. state of KentuckyNatural Bridge State Park (Massachusetts), in the U.S. state of MassachusettsNatural Bridge State Park (Wisconsin), in the U.S. state of WisconsinNatural Bridges National Monument, in the U.S. state of UtahNatural Bridges State Beach (California), in Santa Cruz, CaliforniaAyres Natural Bridge State Park, in the U.S. state of WyomingBattle of Natural Bridge, an American Civil War battle in FloridaNatural Bridge Battlefield State Historic Site at the site of the battleTonto Natural Bridge, in the U.S. state of ArizonaTonto Natural Bridge State Park, in the U.S. state of Arizona
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"Natural Bridges" redirects here; for the US National Monument, see Natural Bridges National Monument. A natural arch or natural bridge is a natural formation (or landform) where a rock arch forms, with a natural passageway through underneath. Most natural arches form as a narrow ridge, walled by cliffs, become narrower from erosion, with a softer rock stratum under the cliff-forming stratum gradually eroding out until the rock shelters thus formed meet underneath the ridge, thus forming the arch. Natural arches commonly form where cliffs are subject to erosion from the sea, rivers or weathering (sub-aerial processes); the processes "find" weaknesses in rocks and work on them, making them bigger until they break through.
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An arch-shaped stretch of bedrock remaining in a karst region when the surrounding bedrock has dissolved.