The island is located just off Pearl Beach and is part of the Central Coast Council local government area.

[9] Rat nest depredation has been proven to impact the little penguin population on Granite Island in South Australia.

[10] Public access to the island is by permit, provided by the National Parks and Wildlife Service Regional Manager, and is restricted to conservation, education and research purposes.

[1] On the evening of 25 August 2018 it was reported that Lion Island was fully engulfed in flames following a lightning strike.

[1] In 2005, a documentary film claimed erroneously that the wreckage of a Japanese midget submarine, which disappeared after the attack on Sydney Harbour in 1942, was buried under sand on the seabed, just east of Lion Island.