Karst field or karstic field is a large flat plain in
karst territory with areas usually 5 to 400 km². The original name is polje (lit. "field") in
South Slavic languages.They are mostly distributed in subtropical and tropical latitudes but some also appear in temperate or, rarely, boreal regions. Usually covered with thick
sediments, called "terra rossa", they are used extensively for agricultural purposes.Some poljes of the
Dinaric Alps are inundated during the rainy winter and spring seasons as masses of water called vrulja appears at the margins. The water disappears through shafts called ponor.
See more at Wikipedia.org...