- 1. A residual portion of the roof of a subsurface karst cavity which has not collapsed. Such a natural arch may occur as a surface topographic feature, or as a part of a cave system .2. A rock arch or very short natural tunnel; contrasted with natural bridge, which spans a ravine or valley .Synonyms: (French.) arche naturelle; (German.) natürlisches Gewölbe, Naturbrücke, Felsfenster, Felsbrücke; (Greek.) physike apsitha; (Italian.) arco naturale; (Russian.) estestvennij arka; (Spanish.) arco natural; (Turkish.) do™ al kemer; (Yugoslavian.) prirodni svod, luk, naravni obok.See also natural bridge.
A Lexicon of Cave and Karst Terminology with Special Reference to Environmental Karst Hydrology. Courtesy of the author & The Karst Waters Institute. 2002.
Look at other dictionaries:
Natural arch — Natural bridges redirects here. For the U.S. National Monument, see Natural Bridges National Monument. The Delicate Arch in Arches National Park in Utah, United States. A natural arch or natural bridge is a natural geological formation where a… … Wikipedia
Natural Arch, Tirumala hills — Coordinates: 13°41′N 79°25′E / 13.69°N 79.42°E / 13.69; 79.42 … Wikipedia
Natural Bridge State Resort Park — Natural Bridge as viewed from Overlook Point Location Powell County Wolfe County … Wikipedia
Natural Bridge — or Natural Bridge can refer to several things: Natural arch, a land formation sometimes referred to as a natural bridge Natural Bridge, Alabama Natural Bridge, New York Natural Bridge, Queensland, in the Gold Coast hinterland, Australia Natural… … Wikipedia
Arch Rock (Tasmania) — Arch Rock is a sandstone islet, with an area of 0.44 ha and containing a natural arch, in south eastern Australia. It is part of the Partridge Island Group, lying close to the south eastern coast of Tasmania, in the D Entrecasteaux Channel… … Wikipedia
Arch Rock — may refer to:* Arch Rock (Mackinac Island), Michigan, USA * Arch Rock (Tasmania), Australia * Three Arch Rocks National Wildlife Refuge, Oregon, USAee also* Natural arch * Arches National Park … Wikipedia
Natural Bridge State Park (Wisconsin) — Coordinates: 43°20′39″N 89°55′47″W / 43.34417°N 89.92972°W / 43.34417; 89.92972 … Wikipedia
Arch — For other uses, see Arch (disambiguation). A masonry arch 1. Keystone 2. Voussoir 3. Extrados 4. Impost 5. Intrados 6. Rise 7. Clear span 8. Abutment An arch is a structure that spans a space while… … Wikipedia
Natural Bridge — a natural limestone bridge in western Virginia. 215 ft. (66 m) high; 90 ft. (27 m) span. * * * or natural arch Naturally created arch formation resembling a bridge. Most are erosion features that occur in sandstone or limestone. Some are formed… … Universalium
arch — arch1 /ahrch/, n. 1. Archit. a. a curved masonry construction for spanning an opening, consisting of a number of wedgelike stones, bricks, or the like, set with the narrower side toward the opening in such a way that forces on the arch are… … Universalium