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The Muldjewangk is a water-creature in Australian Aboriginal mythology that inhabited the Murray River, particularly Lake Alexandrina. It was used as a deterrent for Aboriginal children who wished to play near the riverside after dark. Sometimes they are portrayed as evil merfolk (half man half fish), or times as a gargantuan monster. It is also inconsistent whether there are many of the creatures, or a single "The Muldjewangk".
A legend tells of a monstrous Muldjewangk who once attacked a steamboat owned by European settlers. The captain saw two great hands grasping the hull of the boat so he grabbed his gun. Aboriginal elders on board warned the captain not to shoot, but their pleas fell on deaf ears. "You're going to suffer now," they warned. Soon after, the captain broke out in weeping red blisters over his body, and took six months to die.