Tarrabool Lake is one of Australia’s largest wooded swamps, located about 160km north-east of Tennant Creek. The Lake waters most frequently occupy an inner basin of about 400km² but the extent of the flooded area varies enormously from year to year depending on that season’s rainfall. In exceptionally wet years the Lake will join with Eva Downs Swamp in the north to cover an area of over 2750km², forming one of the largest freshwater wetlands in inland Australia. Tarrabool Lake is unique in its Eucalyptus coolibah dominance, providing it with a wooded area of at least 1200km². The Lake supports large areas of grassland, open lignum and bluebush shrubland.