[1] The caves are sited within the Bungonia State Conservation Area adjoining the Morton National Park, about 35 kilometres (22 mi) east of Goulburn and about 125 kilometres (78 mi) south-west of Sydney.
[citation needed] The caves are formed in limestone at the southern extremity of the Sydney basin, a broad expanse of New South Wales between this point, the city of Newcastle in the north, the town of Lithgow to the west and the Pacific Ocean to the east.
Drum Cave is closed annually from 1 November through to 1 April in order to provide a safe environment for the bats during their breeding season, but is open and available to the public for the remainder of each year.
[citation needed] Many fossils can be found along the various walking tracks in the vicinity of the caves.
[citation needed] There are over 190 caves at Bungonia, though some of these are not much more than small holes in the ground.