Flinders Island is only one of the many islands included in the Municipal area. Of these islands Flinders Island is the only island with more than one permanent settlement, and is by far the largest in the Furneaux Group.

The island is about 62 km from north to south, and 37 km from east to west. with a total land area of 1333 km2. Mount Strzelecki in the south west is the island's highest peak at 782 m. About a third of the island is mountainous and rugged with ridges of granite running the length of