The white phosphogypsum hills of AB Lifosa are a unique phenomenon not only in Lithuania but in the whole Baltic region. Phosphogypsum is gypsum with a small admixture of phosphates (fertiliser) produced during the manufacture of phosphoric acid. The hills began to be piled up next to the fertiliser plant in 1968. More than 21 million tonnes of phosphogypsum have now accumulated. About 5,500 tonnes of phosphogypsum are added to the hills every day, so they grow by roughly two million tonnes a year. The hills currently cover about 84 hectares, and some reach a height of 60 metres. The hills formed earlier have now been planted and are covered with trees and grass. The phosphogypsum hills are surrounded by ponds, where migrating cranes like to stop over. The site is not open to visitors, but the towering hills can be seen from as far as 5 kilometres away.