A polje, also called karst polje or karst field, is a large flat plain found in karstic geological regions of the world, with areas usually in the range of 5–400 km2 (2–154 sq mi). The name derives from the Slavic languages, where polje literally means 'field', whereas in English polje specifically refers to a karst plain or karst field.
Livanjsko Polje in Bosnia is the largest polje in the world (Mount Dinara visible in the background).
The Minde-Mira de Aire Polje floods in the winter months
Karst is a topography formed from the dissolution of soluble carbonate rocks such as limestone, dolomite, and gypsum. It is characterized by features like poljes above and drainage systems with sinkholes and caves underground. More weathering-resistant rocks, such as quartzite, can also occur, given the right conditions.
Škocjan Caves, Slovenia
Lijiang fengcong (cone karst) in Guilin as part of the South China Karst.
Karst formation of the Serra de Tramuntana
Global distribution of major outcrops of carbonate rocks (mainly limestone, except evaporites)