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Misool Island
Misool Island, southernmost of Raja Ampat's four main islands in Southwest Papua, Indonesia. Known for Silurian-Devonian rocks, karst and marine lakes, the 300,000-acre Misool Marine Reserve, prehistoric rock art, and reef biodiversity.
Mohéli
Mohéli (Mwali) is the smallest island of the Union of the Comoros in the Mozambique Channel, a 2020 UNESCO biosphere reserve with Moheli National Park, green turtle nesting sites, and a history of French protection from 1886 and 1997 secession.
Molokai
Molokai (Molokaʻi), fifth largest Hawaiian island, formed by West and East Molokai shield volcanoes; known for its 3,000-foot north shore sea cliffs, the Kalaupapa Hansen's disease settlement, a rural Native Hawaiian community of about 7,000-8,100, and minimal tourism.
Møn
Møn, Danish Baltic Sea island in Vordingborg Municipality, 218 km², 9,052 inhabitants, town Stege. Home to Møns Klint chalk cliffs, Denmark's first UNESCO biosphere reserve (2017), and a 2025 World Heritage Site.
Montague Island
Montague Island names two islands: Barunguba Montague Island, a 0.82 km² NSW nature reserve with little penguins and fur seals off Narooma, Australia, and Montague Island, the 850 km² largest island of Alaska's Prince William Sound, uplifted by the 1964 earthquake.
Monuriki
Monuriki (Monu Riki) is an uninhabited 40-hectare volcanic island in Fiji's Mamanuca group, 45 km west of Nadi, rising to 178 m. Known as the Cast Away filming location and a Key Biodiversity Area holding the third-largest Fijian crested iguana population after goat and rat eradication in 2011.
Mornington Island
Mornington Island (Gununa), largest of the 22 Wellesley Islands in Queensland's Gulf of Carpentaria; Lardil Traditional Owners, Presbyterian mission from 1914, shire since 1978, township Gununa of about 1,200 people.
Mors
Mors, Danish island in the Limfjord (Morsø Kommune), 363 km², 19,520 residents (2025); known for 55-million-year-old moler cliffs, Hanklit, and 2026 UNESCO World Heritage fossil site.
Motu Tuba
Motu Tuba, also known as Tuba Island, is an island in Kiritimati, the largest purely coralline island in the world, in the Line Islands of Kiribati, central Pacific.
Moureaux Islands
Moureaux Islands (Îles Moureaux): two islands and off-lying rocks 2.5 miles WNW of Pelletan Point in Flandres Bay, west Graham Land, Antarctica, at 65°05'S 63°08'W; charted and named by the Belgian Antarctic Expedition, landing February 1898.
Mud flat
A mud flat is a level coastal or lakeshore area of fine-grained sediment that the tide alternately covers and uncovers, forming in sheltered bays, estuaries, and lagoons.
Mull of Kintyre
Mull of Kintyre: southern headland of Scotland's Kintyre peninsula, site of a 1788 Northern Lighthouse Board light built by Thomas Smith with Robert Stevenson, automated 1996, Category A listed.
Murano
Murano: island group in the northern Venetian Lagoon, 1.5 km from Venice, center of Venetian glassmaking since the 1291 furnace transfer; also known for the Glass Museum and Basilica of Santi Maria e Donato.
Mustique
Mustique: private island in the Grenadines, Saint Vincent and the Grenadines, bought by Colin Tennant in 1958 and run by the homeowner-owned Mustique Company; about 109 villas, one hotel, Basil's Bar, and a 1,000-yard no-take conservation area.
Muyua Island
Muyua Island, also Woodlark Island or Muyuw/Murua, is an ~874 km² island in Milne Bay Province, Papua New Guinea, ~600 km east of Port Moresby, with Miocene volcanics, megalithic burials, kula exchange ties, and the Woodlark Gold Project.
Mykonos (Μύκονος)
Mykonos (Μύκονος), Cyclades island in the Aegean: 86 km², 10,962 residents (2021), Neolithic Ftelia and Mycenaean Angelika sites, desalination-dependent water supply, and over two million annual visitors driving overtourism measures.
Namdrik Atoll
Namdrik Atoll (Namdik, Namorik) is a two-islet coral atoll in the Ralik Chain, Marshall Islands, with an enclosed lagoon lacking navigable passes, a 2012 Ramsar designation, black-lip pearl farming, and a noted community-based adaptation program.
Nanpō Islands
The Nanpō Islands (南方諸島, Nanpō Shotō, "Southern Islands") are the volcanic Japanese island groups stretching about 1,200 km south from Tokyo Bay: the Izu, Ogasawara (Bonin), and Kazan (Volcano) Islands.
Nansen Island
Nansen Island (Isla Nansen Sur) is the largest island in Wilhelmina Bay, off the west coast of Graham Land, Antarctica, at 64°35'S 62°05'W. Discovered and named Île Nansen by the Belgian Antarctic Expedition under Gerlache (1897-99) for Fridtjof Nansen; distinct from the Nansen Island in Franz Josef Land, Russia.
Nantucket
Nantucket, also called "The Faraway Land" in Wampanoag, is an island, town, and county 30 miles off Cape Cod, Massachusetts: 14 miles long, a former whaling capital, now an upscale summer resort.
Nares Land
Nares Land is an uninhabited 1,466 km² island in Nordgrønland, northern Greenland, at about 82°25′N 45°W, named for explorer George Nares; Franklinian basin Lower Palaeozoic carbonates with Zn-Pb showings at Kap Wohlgemuth.
Natuna Besar
Natuna Besar (Bunguran), largest island of Indonesia's Natuna archipelago in the South China Sea, Riau Islands Province; town Ranai, Gunung Ranai 959 m, Malay-peninsular bird genetics, endemic Kekah langur.
Navassa Island
Navassa Island: uninhabited ~5 km² U.S. Caribbean island west of Haiti, claimed 1857 under the Guano Islands Act, guano/phosphorite mined to 1898, a National Wildlife Refuge since 1999, and disputed by Haiti.
Necker Island (British Virgin Islands)
Necker Island: 74-acre private island in the North Sound, British Virgin Islands, owned by Richard Branson since 1979 ($180,000 purchase) and run by Virgin Limited Edition as a buyout-only luxury resort, about $105,000 a night.
Necker Island (Hawaii)
Necker Island (Mokumanamana) is a small basalt island in the Northwestern Hawaiian Islands, 155 miles northwest of Nihoa, with 52 pre-contact Hawaiian religious sites, solstice-aligned heiau, named by La Pérouse in 1786.
Negros
Negros (native name Buglas) is the fourth-largest Philippine island in the Visayas, split into Negros Occidental and Negros Oriental since 1890, famed for sugar, Kanlaon volcano, and the 2024 Negros Island Region.
Nelson Island
Nelson Island, South Shetland Islands, Antarctica: 22 km by 13 km island southwest of King George Island, 95% covered by a temperate ice cap, with protected Harmony Point (ASPA 133) and its chinstrap penguin colony. Distinct from Nelson Island, British Columbia.
Nendö Island
Nendö (Ndeni, Nendo, Ndende, Santa Cruz Island) is the largest of the Santa Cruz Islands in Temotu Province, Solomon Islands; a Lapita-settled volcanic-limestone island with non-Austronesian languages, Graciosa Bay, and a 2013 tsunami.
Nevis
Nevis is the smaller, volcanic sister island of Saint Kitts in the Leeward Islands, capital Charlestown, about 13,000 people on 36 square miles, governed by the Nevis Island Administration under Premier Mark Brantley.
New Britain
New Britain, formerly Neu-Pommern under German rule, is the largest island of the Bismarck Archipelago in Papua New Guinea, about 610 kilometers long and home to over 500,000 people.