The agricultural landscape of southern Öland (Swedish: södra Ölands odlingslandskap) is an area of more than 56,000 hectares (140,000 acres) located on the island of Öland, Sweden. It includes Stora alvaret (great alvar), a limestone plateau of around half that surface. Stora alvaret is a dagger-shaped area almost 40 km (25 mi) long and about 10 km (6.2 mi) at its widest north end. This limestone plain, around a quarter of the surface of the island, is the most extended of its kind in Europe. As a result of the thin layer of soil and high pH levels, it presents a wide range of plants, including many rare species.