Named after the Karst region in Slovenia, a karst landscape is a geographical feature and is usually formed in areas were limestone is a common rock. Limestone is permeable as it allows water to pass through it. When water mixes with carbon dioxide, it creates a weak carbonic acid which when in contact with the calcite in limestone dissolves. As it goes though the ground, the water becomes more acidic as it mixes with more carbon dioxide. Over time, the rock is dissolved overtime and a karst landscape is formed. The Burren in County Clare, Ireland is an example of a karst landscape as is the Karst region in Slovenia.