natural arch

   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 [20].
   2. A rock arch or very short natural tunnel; contrasted with natural bridge, which spans a ravine or valley [10].
   Synonyms: (French.) arche naturelle; (German.) natürlisches Gewölbe, Naturbrücke, Felsfenster, Felsbrücke; (Greek.) physike apsitha; (Italian.) arco naturale; (Russian.) estestvennij arka; (Spanish.) arco natural; (Turkish.) doal 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. . 2002.

Look at other dictionaries:

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