Karst topography is a geological formation shaped by the dissolution of a layer or layers of soluble bedrock, usually carbonate rock such as limestone or dolomite, but also in gypsum. It has also been documented for weathering-resistant rocks, such as quartzite, given the right conditions. This is an incomplete list of the major karst landscape areas of the world.
Karst poljas (Bosnian, Croatian, Serbian: kraška polja)
Alaska
Arizona
California
Illinois
Indiana
Kentucky
Michigan
Missouri, Arkansas
Nevada
New Mexico
Oklahoma
Oregon
South Dakota
Tennessee
Texas
Utah
Virginia
West Virginia
Wisconsin, Minnesota, Iowa, Illinois