Arguably Australia’s most picturesque sinkhole is the Umpherston Sinkhole in Mount Gambier. Known as the Sunken Garden, the sinkhole was naturally created when the limestone chamber’s roof collapsed, leaving a magnificent void. In 1886 James Umpherston transformed the cavity into a lush oasis accessible via a series of concealed steps, walkways and terraces. The garden features a fountain, hydrangeas, and tree-ferns and is home to hundreds of possums.
Jubilee Hwy E, Mount Gambier SA Australia +61 8 8724 9750