"Lavogne in Istria" Hum Off The Beaten Path Tip by JLBG

Hum Off The Beaten Path: 2 reviews and 2 photos

  Lavogne in Istria
by JLBG
 
 

This formation is characteristic of the karst. A doline or sinkhole is a closed depression draining water underground in karst areas. It can be cylindrical, conical, bowl- shaped or dish-shaped. The diameter ranges from a few to many hundreds of meters. The name doline comes from dolina, the Slovenian word meaning valley. So this was originally a colloquial Slovenian word that is now used by geologists to describe a geologic feature.

Rainwater dissolves carbonic gas (CO2) and give carbonic acid. When it infiltrates into the soil, it dissolves the limestone (calcium carbonate, CaCO3), which makes a depression. Once limestone is dissolved, there remains its impurities, clay, which makes a waterproof layer. This is why the vegetation in dolines is always greener than the landscape around. Dolines are often cultivated as this is a place keeping moisture, which is a rare thing in waterless karst areas. In some occurrence, there can even form a small pond. Man can help this process and mason the bottom, making a watering place for cattle. In the French karstic Causse regions (around Roquefort, for example), these watering places are called "lavogne". Look at my Roquefort page to see a French lavogne. I have not found the Croat name but I am sure that some one will tell me !

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  • Updated Dec 12, 2004
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JLBG

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