Geologically, it is limestone overlying granite and has notable karst features, including caves.
It is leased for farming and is extensively grazed by sheep and cattle as well as the native Tasmanian pademelons.
[2] Recorded breeding seabird and wader species are short-tailed shearwater and sooty oystercatcher.
Cats, house mice and Indian peafowl have been introduced.
[1] The ship City of Edinburgh wrecked on the island on 11 July 1840.