The large blowhole on the limestone cliffs at Robe has recently grown in size and prompted a warning from the seaside council about its likely collapse.

It was originally about half-a-tennis court in size and was first noticed during a peak tourist time of the Queen’s Birthday holiday long weekend in June of last year.

A Robe District Council spokesperson said the structure was now known as the Woe-hole.

“It has grown, with the eastern edge of the hole collapsing further towards the path,” the spokesperson said.

“It is an unstable and dangerous area – the hole is much larger than it appears at the surface and will continue to expand without warning.

“The council has placed additional signage and bunting in the area, please do not cross this barrier.

“There are undercuts up to four metres from the opening, please abide by the signage and do not enter restricted areas.”

Cliff-top erosion prompted the closure several years ago of the public access to the historic red-and-white obelisk at Cape Dombey.