Introduction We took a day trip to Mount Gambier on Tuesday. Mount Gambier is a major regional centre, located roughly half way between Melbourne and Adelaide. It has a population of about 25,000. The major draw card for us was that this region had active volcanos about 4-5000 years ago with major activity about 20-30,000 years before that. The result was a gently undulating country side with rich dark soil (used for growing potatoes and harvestable forest), volcanic craters, caves and sink holes. The centre piece of Mount Gambier are volcanic craters that have filled with water from the aquifer. The largest is the Blue lake, that forms the town’s water supply. In summer it appears a stunning blue colour - apparently as the semi-dissolved calcium carbonate in the lake that came from the limestone layer,
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