The giant freshwater crayfish is found only in northern Tasmania, in the rivers and creeks that flow towards Bass Strait (click here to see the interactive distribution map in the Atlas of Living Australia). Historically, its range extended from the Arthur River catchment in the west to the Ringarooma River in the East. Today, its eastern populations are fragmented and much lower than in the west. It is not found in the Tamar river catchment. It is only found at altitudes below 400 metres, and so is restricted to the coastal plain and just the foothills of northern Tasmania’s mountains.
