Gabo Island is a 154-hectare (380-acre) island located off the coast of eastern Victoria, Australia, between Mallacoota and Cape Howe on the border with New South Wales.

It is separated from the mainland by a 500-metre (1,600 ft) wide channel; access is available by arranged flights and boats. Gabo Island is a shipping reference commonly referred to in Victorian weather warnings issued by the Australian Bureau of Meteorology.

The island is home to the world's largest colony of little penguins. Gabo, with the tiny associated islet of Tullaberga at its southern end, has been identified by BirdLife International as an Important Bird Area because of the numbers of breeding penguins (up to 21,000 pairs) and white-faced storm petrels (up to 20,000 pairs).

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