Umpherston Sinkhole~OZ places I've been

Mount Gambier - Heart of the Limestone Coast The lushness of the Mount Gambier area is not only due to its annual rainfall. Its life blood, is the abundance of underground water which lies in the wedge shaped block of limestone beneath the earths surface. Moving slowly southwards towards the ocean through the limestone and its arterial system of caves and crevices the water is plentiful and contributes to the beauty of the citys parks and gardens and to the rural sector. Limestone, formed millions of years ago in a totally marine environment and made up of fossils and corals, extends from the Bordertown area down to the coast at Port MacDonnell where it is more than 300 metres thick. Rainfall soaks down through the surface into the limestone which acts like a huge sponge. Called the unconfined aquifer, the ground water gradually moves southwards underground finally discharging to the ocean at various points along the coast between Port MacDonnell and the Victorian border.This abundance of "groundwater" contibutes greatly to the beauty of the city's parks and gardens and to the rural sector. Mount Gambiers famous Blue Lake, Little Blue Lake, Ewens Ponds and Piccininnie Ponds are just a few of the locations which provide a "window" into this underground water system. - Heart of the Limestone Coast The lushness of the Mount Gambier area is not only due to its annual rainfall. Its life blood, is the abundance of underground water which lies in the wedge shaped block of limestone beneath the earths surface. Moving slowly southwards towards the ocean through the limestone and its arterial system of caves and crevices the water is plentiful and contributes to the beauty of the citys parks and gardens and to the rural sector. Limestone, formed millions of years ago in a totally marine environment and made up of fossils and corals, extends from the Bordertown area down to the coast at Port MacDonnell where it is more than 300 metres thick. Rainfall soaks down through the surface into the limestone which acts like a huge