Mornington Island
The largest island in the group is Mornington Island, and the town of Gununa on Mornington Island is home to the entire population of the locality. Two small islands in the group are designated as the Manowar and Rocky Islands Important Bird Area, because of their importance for breeding seabirds. The South Wellesley Islands and the Forsyth Islands are in the same area. Politically, all are within the local-government area of the Shire of Mornington. Ecologically, they constitute subregion GUP10 of the IBRA Gulf Plains bioregion of Australia.