Question: Achyranthes atollensis are endemic to the island that is of what area?

Context paragraphs:
Vallée de Mai: Vallée de Mai Nature Reserve ("May Valley") is a nature park and UNESCO World Heritage Site on the island of Praslin, Seychelles.  It consists of a well-preserved palm forest, flagship species made up of the island endemic coco de mer, as well as five other endemic palms.  The coco de mer ("Lodoicea maldivica"), a monocot tree in the Arecaceae (palm family), has the largest seeds (double nut seed) of any plant in the world.  Also unique to the park is its wildlife, including birds such as the rare Seychelles black parrot, mammals, crustaceans, snails, and reptiles.  There has been a determined effort to eliminate all the introduced exotic species of plants from the area but this has not been successful in eliminating coffee, pineapple, and ornamental palms thus far.  This forest, with its primitive plant and animal species, is a relict from the time when the supercontinent of Gondwana was divided into smaller parts, leaving the Seychelles islands between the present day Madagascar and India.

Long Island, Marlborough: Long Island is located in the Marlborough Sounds of New Zealand.  It is just over 1.41 km² in area with a length of 4 km ( the long axis being aligned North-east/South-west)and a maximum width of 1 km - hence the name "Long Island".  The island was reserved for public utility on the 26th of March 1926 and soon after became a farm which ran between 300 and 400 sheep until January 14, 1926 when the island became a scenic reserve.  With the removal of stock in the 1930s the island has been left to regenerate back into native bush.  In April 1993 the Long Island-Kokomohua Marine reserve was created around Long island and the tiny Kokomohua islands off its northern tip - it extends 460 m offshore from the high water mark around the islands and was the first Marine reserve to be created in the South Island.  The island itself is also an important wildlife refuge and a number of species of threatened endemic birds which have been reintroduced to it including little spotted kiwi (late 1980s), yellow crowned kākāriki (2001) and South Island saddleback (2005) - all these reintroductions have been successful with healthy breeding populations of each species now present on the Island.

Achyranthes atollensis: Achyranthes atollensis (also called atoll achyranthes or Hawaiʻ i chaff flower) was a species of plant in the Amaranthaceae family.  It was endemic to the Northwestern Hawaiian Islands of Kure, Midway, Laysan and the Pearl and Hermes Atoll.  Its natural habitat was sandy shores.  It became extinct due to habitat loss (residential, commercial and military installation development) and the introduction of non-native species, and was last seen in 1964.  It was a perennial shrub living in dry shrublands on calcareous sand and atolls.

Midway Atoll: Midway Atoll ( ; also called Midway Island and Midway Islands; Hawaiian: "Pihemanu Kauihelani") is a 2.4 sqmi atoll in the North Pacific Ocean at .  As its name suggests, Midway is roughly equidistant between North America and Asia.  Midway Atoll is an unorganized, unincorporated territory of the United States.  Midway continues to be the only island in the Hawaiian archipelago that is not part of the state of Hawaii.  Unlike the other Hawaiian islands, Midway observes Samoa Time (, i.e., eleven hours behind Coordinated Universal Time), which is one hour behind the time in the state of Hawaii.  For statistical purposes, Midway is grouped as one of the United States Minor Outlying Islands.  The Midway Atoll National Wildlife Refuge, encompassing 590991.50 acre of land and water (mostly water) in the surrounding area, is administered by the United States Fish and Wildlife Service (FWS).  The refuge and most of its surrounding area are part of the larger Papahānaumokuākea Marine National Monument.

Achyranthes margaretarum: Achyranthes margaretarum is a species of plant belonging to the family Amaranthaceae.  It is endemic to Phillip Island, close to Norfolk Island in the south west Pacific Ocean, where it was discovered during the 1980s after rabbits had been eradicated from the island.  This provides dramatic evidence of the value of the eradication program.  It is considered critically endangered due to its very small population size - fewer than 20 mature individuals were known, in a single location on Phillip Island, in 2003.  In 2009 Mills identified 22 plants on Phillip Island, including planted specimens, only nine higher than 50 cm.

List of birds of Tasmania: A total of 262 species of bird have been recorded living in the wild on the island of Tasmania, nearby islands and islands in Bass Strait, 182 of which are regularly recorded, while another 79 are vagrants and one is extinct.  Birds of Macquarie Island are not included in this list.  Twelve species are unique (endemic) to the island of Tasmania, and most of these are common and widespread.  However, the forty-spotted pardalote is rare and restricted, while the island's two breeding endemic species, the world's only migratory parrots, are both threatened.  Several species of penguin are late summer visitors to Tasmanian shores.  Tasmania's endemic birds have led to it being classified as an Endemic Bird Area (EBA), one of 218 such areas worldwide.  Priority regions for habitat-based conservation of birds around the world, they are defined by containing two or more restricted-range (endemic) species.

Portland Bight Protected Area: The Portland Bight Protected Area (PBPA) was created by the Jamaican government in 1999 to protect a large marine and terrestrial area on the island of Jamaica located southeast of Kingston.  Nearby cays such as Little Goat Island are included.  It is the largest protected area in Jamaica and comprises 724 mi2 .  Although the first priority in forming the protected area was to protect the coral reefs, it also serves to protect vulnerable and endemic species.  The PBPA includes 32 mi2 of wetlands on the island, and coastlines of mangroves, as well as sea-grass beds that serve as a nursery for fish and shellfish breeding.  The Caribbean Coastal Area Management Foundation (C-CAM) has been charged with managing zones within the protected area.

Santiago Island (Galápagos): Santiago Island (] ) is an island of the Galápagos Islands.  It is also known as San Salvador, named after the first island discovered by Columbus in the Caribbean Sea (see San Salvador Island), or as James Island.  The island, which consists of two overlapping volcanoes, has an area of 585 km2 and a maximum altitude of 907 m , atop the northwestern shield volcano.  The volcano in the island's southeast Marine Iguanas, sea lions, fur seals, land and sea turtles, flamingos, crabs, dolphins, and sharks are found here.  There are a large number of goats and pigs, animals which were introduced by humans to the islands and have caused great harm to the endemic species.  Darwin Finches and Galápagos Hawks are usually seen as well as a colony of Fur Seals.  At Sullivan Bay, a recent (1897) pahoehoe lava flow can be observed.

Christmas Island red crab: The Christmas Island Red crab ("Gecarcoidea natalis") is a species of land crab that is endemic to Christmas Island in the Indian Ocean.  Low numbers are also found on North Keeling Island, thought to be from larvae drifted from Christmas Island and never been observed to breed.  Although restricted to a relatively small area, it has been estimated that 43.7 million adult Red crabs once lived on Christmas Island alone, but the accidental introduction of the yellow crazy ant is believed to have killed about 10–15 million of these in recent years.  Christmas Island Red crabs are well known for their annual mass migration to the sea to lay their eggs in the ocean.

North Keeling: North Keeling is a small, uninhabited coral atoll, approximately 1.2 km2 in area, about 25 km north of Horsburgh Island.  It is the northernmost atoll and island of the Australian territory of the Cocos (Keeling) Islands.  North Keeling comprises just one C-shaped island, a nearly closed atoll ring with a small opening into the lagoon, about 50 m wide, on the east side.  The lagoon is about 0.5 km2 in area.  The island is home to the only surviving population of the endemic, and endangered, Cocos buff-banded rail, as well as large breeding colonies of seabirds.  Since 1995, North Keeling Island and the surrounding sea to 1.5 km from shore have been within the Pulu Keeling National Park.

Supporting paragraphs: Achyranthes atollensis Midway Atoll
Answer: 2.4 sqmi