The Chestnut Teal is found in south-western and south-eastern Australia. In the east, it is found from Rockhampton, Queensland to Ceduna, South Australia, being most common in New South Wales, Victoria and Tasmania.
on wetlands and estuaries in coastal regions, and is one of the few ducks able to tolerate high salinity waters, although it still needs fresh water for drinking. It will also use open freshwater lakes, reservoirs and sewage ponds during dry seasons. It mainly breeds in coastal areas, needing hollow trees in water or short grasslands near water for nesting, and it will readily take to suitable nest boxes.
Reference: Australian Museum