Mount Gambier is our first stop in the state of South Australia. This small and friendly town on the Limestone Coast is the state's second largest after Adelaide. It is worth stopping there at least for one night. The area includes some geological sites of national or international importance. A few minutes walk from the centre of Mount Gambier, the Blue Lake fills the crater of an extinct volcano. In summer, the water is an incredible blue. In winter, it is tinged with gray. It seems that it is the only blue lake in the world. The Umpherston Sinkhole, located in the heart of the town, has a garden at the bottom of an impressive natural crater. We suggest visiting it at night to be able to approach and feed the possums that inhabit it.
