Dye injection points inserted into the Pumicestone Passage. This animation shows how much larger the tidal excursions are in the southern estuary due to the large unobstructed opening and the complexity of flows within the Passage. Data originally supplied by Genevieve Larsen from her MAppSc 2007, (Model of surface water flows, tidal responses and effect of flood events using SMS. School of Natural Resource Sciences, QUT). Images have been enhanced and summary animations produced by Genevieve Larsen, David Warne, Joe Young and Malcolm Cox, 2011. For further information visit: www.isr.qut.edu.au/gsr/gvs