The Umpherston Sinkhole is a unique geological formation located in Mount Gambier, South Australia. It was created when the limestone cave roof collapsed, forming a large, open pit. The sinkhole is about 50 meters wide and 30 meters deep, making it a popular attraction for visitors. Today, the sinkhole is beautifully landscaped with gardens, walking paths, and a variety of plants. It features a stunning display of ferns and flowers, providing a serene environment for relaxation and exploration. The site also includes picnic areas, making it a great spot for families and nature lovers.