St Michaels Cave is situated in the Sydney suburb of Avalon Beach.

The original colonial owner was a Reverend John Therry, who planned to deliver lectures within the cave and build a church above it.

The cave was formed by the erosion of a jurassic dyke through triassic sedimentary rocks.

The cave is known to be a breeding site for Common bent-wing bats and Large-eared pied bats.

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