
A polje (ə; lang), also karst polje or karst field, is a large flat plain found in karstic geological regions of the world, with areas usually 5 to 400 km². The name derives from the Slavic languages and literally means `field`, where in English `polje` describes specifically as karstic plain or field as explained previously. ==In geology== ...
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http://en.wikipedia.org/wiki/Polje

(Serbo-Croatian: `field`), elongated basin having a flat floor and steep walls; it is formed by the coalescence of several sinkholes. The basins ... [4 related articles]
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http://www.britannica.com/eb/a-z/p/88

A large extensive closed depression draining underground, with a flat floor across which there may be an intermittent or perennial stream and which may be liable to flood and become a lake. The floor makes a sharp break with parts of surrounding slopes. The polje may be a regional karst feature which includes other smaller depressions such as dolin...
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http://www.cancaver.ca/docs/glossary.htm
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