The Grotto is a geological formation known as a sink hole which can be found on the Great Ocean Road just outside of Port Campbell. It is a popular tourist attraction. Wooden steps wind down the cliff face to the bottom where the sea is visible beyond a quiet pool at low tide. A special type of sinkhole - formed by rainwater leaking through the pavement and carrying dirt into a ruptured sewer pipe Sinkholes, also known as sinks, dolines (in Slavic languages dolina means valley), and cenotes, are formed by the collapse of cave roofs and are a feature of landscapes that are... Great Ocean Road Main Gate at Eastern View The Great Ocean Road stretches along the South Eastern coast of Australia between the Victorian cities of Geelong and Warrnambool. ... Port Campbell is a small town on the Great Ocean Road in Victoria, Australia. ...