Flat Top Island is a 1.58 ha

Hectare

The hectare is a metric unit of area defined as 10,000 square metres , and primarily used in the measurement of land. In 1795, when the metric system was introduced, the are was defined as being 100 square metres and the hectare was thus 100 ares or 1/100 km2...

 island in south-eastern Australia

Australia

Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...

. It is part of the Maatsuyker Island Group

Maatsuyker Islands

The Maatsuyker Islands Group is a group of islands and rocks located 5.5 kilometres off the south coast of Tasmania. Maatsuyker Island is the southernmost island of the group and of the Australian continental shelf. There are exposed rocks further south of Maatsuyker but they do not meet the...

, lying close to the southern end of the south-western coast of Tasmania

Tasmania

Tasmania is an Australian island and state. It is south of the continent, separated by Bass Strait. The state includes the island of Tasmania—the 26th largest island in the world—and the surrounding islands. The state has a population of 507,626 , of whom almost half reside in the greater Hobart...

. It is also part of the Southwest National Park

Southwest National Park

The Southwest National Park is a national park located in the south-west of Tasmania, Australia. The park is Tasmania's largest and forms part of the Tasmanian Wilderness World Heritage Area....

, and thus within the Tasmanian Wilderness

Tasmanian Wilderness

The Tasmanian Wilderness is a term that is used for a range of areas in Tasmania, Australia.The World Heritage Areas in South West, Western and Central are the most well known. However, there are also other areas in Tasmania that have the elements of being known as wilderness areas, the Tarkine...

 World Heritage Site

World Heritage Site

A UNESCO World Heritage Site is a place that is listed by the UNESCO as of special cultural or physical significance...

. The island is part of the Maatsuyker Island Group Important Bird Area

Important Bird Area

An Important Bird Area is an area recognized as being globally important habitat for the conservation of bird populations. Currently there are about 10,000 IBAs worldwide. The program was developed and sites are identified by BirdLife International...

, identified as such by BirdLife International

BirdLife International

BirdLife International is a global Partnership of conservation organisations that strives to conserve birds, their habitats and global biodiversity, working with people towards sustainability in the use of natural resources...

 because of its importance as a breeding site for seabirds.

Fauna

Recorded breeding seabird

Seabird

Seabirds are birds that have adapted to life within the marine environment. While seabirds vary greatly in lifestyle, behaviour and physiology, they often exhibit striking convergent evolution, as the same environmental problems and feeding niches have resulted in similar adaptations...

 species are the Short-tailed Shearwater

Short-tailed Shearwater

The Short-tailed Shearwater or Slender-billed Shearwater , also called Yolla or Moonbird, and commonly known as the muttonbird in Australia, is the most abundant seabird species in Australian waters, and is one of the few Australian native birds in which the chicks are commercially harvested...

 (400 pairs), Fairy Prion

Fairy Prion

The Fairy Prion is a small seabird with the standard prion plumage of black upperparts and white underneath with an "M" wing marking.-Taxonomy:...

 (5000 pairs), Common Diving-Petrel (1000 pairs) and Pacific Gull

Pacific Gull

The Pacific Gull is a very large gull, native to the coasts of Australia. It is moderately common between Carnarvon in the west, and Sydney in the east, although it has become scarce in some parts of the south-east, as a result of competition from the Kelp Gull, which has "self-introduced" since...

. The island is a haul-out

Hauling-out

Hauling-out is the behaviour associated with pinnipeds , of temporarily leaving the water between periods of foraging activity for sites on land or ice...

 site for the Australian Fur Seal. The Tasmanian Tree Skink

Tasmanian Tree Skink

The Agile Cool-skink or Tasmanian Tree Skink is a species of skink in the Scincidae family. It is endemic to Tasmania and the Bass Strait islands. It is viviparous, and may be found in a wide variety of habitats, from tall forests to rocky coastlines....

is present.