1. 
   Ponor
   A ponor is a natural surface opening that may be found in landscapes where the geology and the geomorphology is characterized by some kind of karst. Whereas a sinkhole is a depression (doline) of surface topography with a pit or cavity directly underneath, a ponor is kind of a portal where a surfac...
   Found op http://en.wikipedia.org/wiki/Ponor
   
   
2. 
   Ponor
   [disambiguation] Ponor is a natural surface opening in karst limestone landscapes. It may also mean: ...
   Found op http://en.wikipedia.org/wiki/Ponor_(disambiguation)
   
   
3. 
   Ponor
   [Knjaževac] Ponor (Knjaževac) is a village in the municipality of Knjaževac, Serbia. According to the 2002 census, the village has a population of 144 people. ...
   Found op http://en.wikipedia.org/wiki/Ponor_(Knjaževac)
   
   
4. 
   Ponor
   [Pale] Ponor (Pale) is a village in the municipality of Pale, Bosnia and Herzegovina. ...
   Found op http://en.wikipedia.org/wiki/Ponor_(Pale)
   
   
5. 
   Ponor
   [Pirot] Ponor (Pirot) is a village in the municipality of Pirot, Serbia. According to the 2002 census, the village has a population of 379 people. ...
   Found op http://en.wikipedia.org/wiki/Ponor_(Pirot)
   
   

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