We visited the Umpherston Sinkhole in Mount Gambier today. Once a cave formed through dissolution of the limestone, the sinkhole was created when the top of the chamber fell to the floor of the cave, creating its “sunken garden” effect.

Originally beautified by James Umpherston around 1886, it is open at all times. Apparently possums are active after dusk.

It probably looks more spectacular in spring/summer and in twilight, but even on a winter’s day it’s an impressive sight.