It forms open habitats with plenty of sunlight and limited shade. Woodlands may support layers of vegetation beneath the main canopy of a forest. They contain shrubs and herbaceous plants including grasses. Higher densities and areas of trees, with largely closed canopy, provide extensive and nearly continuous shade is referred to as forest. The Limestone Coast is a woodland in South Australia. It is in the southeast coast of South Australia from the Victoria border to towards the city of Adelaide. The Limestone Coast supports farming, viticulture, and forestry. Much of the region is low-lying. The plains are lined by rows of low sand hills parallel to the coast much of the land between the sand hills was swamp fed by streams and subject to flood. A network of drains totaling 1450 km has been constructed to channel the water away through the sand hills to the ocean. Important areas of wetland remain including the lakes and lagoons around the Murray Mouth. Its latitude and longitude are 37° 10' 8'' South, 139° 46' 21'' East There are deep limestone deposits created form the coral and other sea life. The natural vegetation was woodland of River Red Gum and other eucalyptus trees. There are few purely common species the coast is rich in wildlife including possums, Cercartetus pygmy possums, Petaurus Gliding possums, and other marsupials many of which do not spread further than west. Common species include reptiles such as the Striped Legless Lizard and invertebrates like an endemic cave cricket. The Naracoorte caves are occupied by the Common Bent-wing Bat. The lakes and lagoons are particularly important habitats for water birds. They include the Black Swan, Grey Teal, and the Pacific Black Duck. Most of the original habitat has been cleared for agriculture. As a result, most native wildlife has also disappeared or been severely reduced in number with introduced species of animals an ongoing threat to that which remains. The Orange-bellied Parrot is a critically endangered species which winters there. The Limestone Coast is wetter and cooler along the southern coastal fringe grading to warm to hot and dryer inland. Mean annual rainfall ranges from 800 mm south east of Mount Burr to 450 mm