Kiritimati in the context of "Operation Grapple"

Kiribati, officially the Republic of Kiribati, is an island country in the Micronesia sub-region of Oceania in the central Pacific Ocean. The state comprises 32 atolls and other islands and one remote raised coral island, Banaba. Its total land area is 811 km (313 sq mi) dispersed over 3,441,810 km (1,328,890 sq mi) of ocean. The spread of the country's islands, from Banaba in the west to Kiritimati in the east straddles the equator and the 180th meridian. The International Date Line goes around Kiribati and swings far to the east, almost reaching 150°W. This brings Kiribati's easternmost islands, the southern Line Islands south of Hawaii, into the same day as the Gilbert Islands and places them in the most advanced time zone on Earth: UTC+14.

The permanent population of Kiribati is over 119,000 as of the 2020 census, and more than half live on Tarawa. There is also a significant number of I-Kiribati forming a diaspora, the largest of which still growing via emigration is probably in New Zealand; historically, diasporic communities were created through over-population resettlement in the Solomon Islands on Ghizo and Wagina, and through intermarriage in the United Kingdom and United States. Another country with growing diasporic communities born of recent labour immigration is Australia.

A raised coral atoll or uplifted coral atoll is an atoll that has been lifted high enough above sea level by tectonic forces, protecting it from scouring by storms and enabling soils and diverse – often endemic – species of flora and fauna to develop. With the exception of Aldabra in the Indian Ocean and Henderson Island in the Pacific Ocean, most tropical raised atolls have been dramatically altered by human activities such as species introduction, phosphate mining, and even bomb testing.

The Line Islands, Teraina Islands or Equatorial Islands (Gilbertese: Aono Raina) are a chain of 11 atolls (with partly or fully enclosed lagoons, except Vostok and Jarvis) and coral islands (with a surrounding reef) in the central Pacific Ocean, south of the Hawaiian Islands. Eight of the atolls are parts of Kiribati. The remaining three—Jarvis Island, Kingman Reef, and Palmyra Atoll—are territories of the United States grouped with the United States Minor Outlying Islands. The Line Islands, all of which were formed by volcanic activity, are one of the longest island chains in the world, stretching 2,350 km (1,460 mi) from northwest to southeast. One of them, Starbuck Island, is near the geographic center of the Pacific Ocean (4°58′S 158°45′W / 4.97°S 158.75°W / -4.97; -158.75). Another, Kiritimati, has the largest land area of any atoll in the world. Only Kiritimati, Tabuaeran, and Teraina have a permanent population. Besides the 11 confirmed atolls and islands, Filippo Reef is shown on some maps, but its existence is doubted.

The International Date Line passes through the Line Islands. The ones that are parts of Kiribati are in the world's farthest forward time zone, UTC+14:00. The time of day in these atolls is 24 hours ahead of the state of Hawaii in the United States, which uses UTC−10:00, and 26 hours ahead of some other islands in Oceania, such as Baker Island, which uses UTC−12:00.

Aldabra, the world's second-largest coral atoll (the largest is Kiritimati), is located east of the continent of Africa. It is part of the Aldabra Group of islands in the Indian Ocean that are part of the Outer Islands of the Seychelles, with a distance of 1,120 km (700 mi) southwest of the capital, Victoria on Mahé Island. Initially named by Arab seafarers for its harsh environment, Aldabra became a French colony dependency in the 18th century, leading to the exploitation of its natural resources, particularly giant tortoises. After passing through British hands, Aldabra faced potential military use in the 1960s, but international protests resulted in its protection. The atoll boasts unique geography, featuring the world's largest raised coral reef and a large shallow lagoon. Aldabra's history involves human impact, including failed agricultural ventures.

Post-World War II, conservation efforts increased, leading to its inclusion in the British Indian Ocean Territory and eventual independence for Seychelles. Following an international protest by scientists known as the 'Aldabra Affair,' the Royal Society of London and later the Seychelles Islands Foundation conducted research, leading to Aldabra's declaration as a UNESCO World Heritage Site in 1982. The atoll's flora and fauna, notably the giant tortoises, comprise an 'ecological wonder', with Aldabra serving as a critical breeding ground for various species. Conservation challenges, such as invasive species and plastic pollution, persist, but protective measures, including UNESCO designation, underscore Aldabra's significance as a natural vital scientific research site. Aldabra receives limited tourism to safeguard its delicate ecosystem and is accessible primarily through guided tours.

Teraina (written also Teeraina, also known as Washington Island – these two names are constitutional) is a coral atoll in the central Pacific Ocean and part of the Northern Line Islands which belong to Kiribati. Obsolete names of Teraina are New Marquesas, Prospect Island, and New York Island. The island is located approximately 4.71° North latitude and 160.76° West longitude. Teraina differs from most other atolls in the world in that it has a large freshwater lake (Washington Lake), an open lens, concealed within its luxuriant coconut palm forest; this is the only permanent freshwater lake in the whole of Kiribati.

Measuring about 5.4 by 2.1 kilometres (3.4 by 1.3 miles) NW-SE and SW-NE, it has a land area of about 9.55 square kilometres (3.69 square miles); its circumference is about 15 km (9 mi). The island is generally low-lying, with a maximum elevation ASL of about 5 meters (16 feet), while most of the island rises some three metres (10 feet) high; trees in the dense inland forest grow to several times this height however. At the western end of the island is the capital, Tangkore (or Tengkore). There are (as at the 2020 Census) about 1,893 inhabitants, making it the least-populated of the permanently inhabited Northern Line Islands. However, population density (177 per km) is three times as high as on Tabuaeran and vastly more than on the much larger (300-plus km) Kiritimati with its about 15 people/km.