Lagoons are commonly divided into coastal lagoons and atoll lagoons. Salt was obtained from Muston Lake, White Lagoon, Salt Lagoon and smaller lagoons near Kingscote. PCEF maintains a natural forest reserve, of protected coral reef, freshwater lagoons and coastal mangroves. In spring, they often occur in brackish water coastal lagoons and estuaries. They are found in sheltered areas such as bays, bayous, lagoons, and estuaries. There are many lakes and coastal lagoons. They can be found in harbors, bays, lagoons and estuaries. Much of the coast consists of scenic sandy beaches indented by coastal lagoons. River otters inhabit the freshwater lagoons and streams. The greater flamingo resides in mudflats and shallow coastal lagoons with salt water. They include oxidation ditches, aerated lagoons, and stabilization ponds. The shorelines of both islands are greatly indented with beaches, lagoons, and natural harbors. Many of these special species are associated with shorelines, particularly sand dunes, lagoons, and wetlands. It is marshy and dotted with lakes and lagoons communicating with the ocean. Some species thrive in extreme environments such as hot springs and hypersaline lakes and lagoons.