Kisatchie National Forest, the only National forest in Louisiana, USA, is located in the forested piney hills and hardwood bottoms of seven central and northern parishes. It is part of the Cenozoic uplands (some of Louisiana's oldest rocks) and has large areas of longleaf pine forests (a forest type that has declined significantly over the last century). It is one of the largest pieces of natural landscape in Louisiana, with some 604,000 acres (2,440 km²) of public land, more than half of which is vital longleaf pine and flatwoods vegetation, which support many rare plant and animal species. There are also rare habitats such as hillside seepage bogs and calcareous prairies.