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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 surface stream or lake flows either partially or completely underground into a karst groundwater system.

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  • 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 surface stream or lake flows either partially or completely underground into a karst groundwater system.
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