The Blue Lake is situated in one of three extinct volcanic craters and exposes the crystal clear water that has filtered underground through the limestone, passing slowly beneath the city. Beautiful all year round, in November the lake starts to change colour from winter steel blue to brilliant turquoise blue and then in March changes back to steel blue. The fascinating Aquifer Tour takes you down the original dolomite well shaft in a glass-panelled lift. Learn about the hydrology of Mount Gambier’s water supply and the aquifer system and hear the interesting stories of local history, European settlement, folklore and Aboriginal legend. Fee applies. Café on site.