The Umpherston Sinkhole rivals the Blue Lake as the most popular tourist attraction in Mount Gambier. OneFortyOne declined to comment or provide a photo of the sinkhole. No access to site.

Sinkholes definitely aren't just the stuff of movies and you’ll have front-row seats to Australia’s most spectacular one in Mount Gambier.Umpherston (Balumbul) formed when the limestone roof ...

Among the most impressive of these sites is the Umpherston Sinkhole, also known as The Sunken Garden. While it's unknown exactly when the roof of the cave collapsed to form this massive pockmark ...