The Great Divide in Tasmania on the Lyell Highway marks the point where the geology of the Tasmania changes from the quartzite in the west to the dolerite of the east. It also marks where the weather systems of Tasmania change from the Roaring 40’s of the west to the moisture laden winds from the Southern Ocean. Sounds a bit boring when you describe it like that, but when you see the King William Ranges rising out of the button grass moorlands and bogs it all takes on a majestic splendour. As you drive along the Lyell Highway there is a lay-by which is quite popular, next to it is an information sign explain what the Great Divide is. Hardly anyone reads the sign, they are all too busy looking at and photographing the scenery.