Blue Lake – Mount Gambier
Blue Lake is at Mount Gambier, which is set on the slope of an extinct volcano that rises approximately 150 metres above the plain and protects the deep lake in its crater. In the cooler months of the year, from around March to November, the water is a dull, blue-grey colour, but in summer it turns a stunning sapphire blue. Drive to the Blue Lake for great views, or walk around the rim. Equally fascinating is the network of caves located beneath the town. The tunnels and caverns are an enormous wedge of limestone that stretches south to the coast and north to Bordertown. On Bay Road, one of the main streets, a cave opening has been transformed into a rose garden, and there is a similar sunken garden at Umpherston Sinkhole on Jubilee Highway East.