Entrance Island is a low island located inside the mouth of Franklin Harbor, Eyre Peninsula in South Australia. The island comprises approximately , and falls within the boundaries of the Franklin Harbor Conservation Park and Franklin Harbor Marine Park.Property Location Browser V2 Government of South Australia. Accessed 2014-01-11. Its maximum elevation is approximately 4 metres.Entrance Island Geoview.info Retrieved 2014-01-11. The island provides roosting and nesting habitat for a variety of sea and shorebird species.Eyre Peninsula Coastal Action Plan & Conservation Priority Study Government of South Australia, Eyre Peninsula Natural Resource Management (2011). Retrieved 2014-01-11.

On September 23, 1910, some shearers working on Entrance Island observed a distressed whale reported to be 90 feet long. It had become stranded at low tide, and it escaped when the tide rose."A whale at Cowell" The Advertiser (1910-09-27). Retrieved 2014-01-11. Smaller southern right whales have also been observed from Entrance Island.

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