Umpherston Sinkhole, also known, as The Sunken Garden was once a cave formed through dissolution of the limestone. The sinkhole was created when the top of the chamber collapsed downwards. Now the topsoil down on the floor of the cave forms the perfect environment for the sunken garden.
Originally beautified by James Umpherston around 1886, the sinkhole is open at all times and from dusk each evening the area comes alive with possums as they venture into the floodlit gardens to feed.
The geological processes that have created the sinkholes in the region inspired the sculpture at Umpherston.
A large undercover shelter with group settings for around fifty people and free barbeque are provided.