Using Google Maps and the Sea Level Rise applet, the following maps show 80 metres of sea level rise.
Areas shaded red are those areas inundated. (Click on map symbol to see enlargements.)
Detail of Porters Hill - the ridge keeping the ocean out of the Lake Eyre Basin. About 4km, and only a few tens of metres above 80m.
It won't last long. Be there when that breaks through!
I strongly recommend you check with your local maps to review the location of the 80 metre contour in your area of interest.