The Mary River is a major river system in the South East and Wide Bay–Burnett regions of Queensland, Australia. The Mary River is unique in that it flows south to north. The river is important because it is home to three threatened species, the Mary River turtle, white-throated snapping turtle and the Mary River cod. The Mary River was to be dammed wit…The Mary River is a major river system in the South East and Wide Bay–Burnett regions of Queensland, Australia. The Mary River is unique in that it flows south to north. The river is important because it is home to three threatened species, the Mary River turtle, white-throated snapping turtle and the Mary River cod. The Mary River was to be dammed with the construction of the Traveston Crossing Dam until it was cancelled due to environmental reasons. The river has experienced major floods in 1955, 1992, 1999, 2011, 2013 and 2022.