The Portland Reef (french: Banc Portland) is a submerged shoal not rising above the surface in the

Gambier Islands The Gambier Islands ( or ) are an archipelago in French Polynesia, located at the southeast terminus of the Tuamotu archipelago. They cover an area of , and are made up of the Mangareva Islands, a group of high islands remnants of a caldera alo ...

French Polynesia )Territorial motto: ( en, "Great Tahiti of the Golden Haze") , anthem = , song_type = Regional anthem , song = " Ia Ora 'O Tahiti Nui" , image_map = French Polynesia on the globe (French Polynesia centered).svg , map_alt = Location of Frenc ...

. It is located in the far southeast of the

Tuamotu The Tuamotu Archipelago or the Tuamotu Islands (french: Îles Tuamotu, officially ) are a French Polynesian chain of just under 80 islands and atolls in the southern Pacific Ocean. They constitute the largest chain of atolls in the world, extendin ...

group archipelago, about 68 km southeast from the Gambier Islands, and 30 km SSE from Temoe Atoll, below the

Tropic of Capricorn The Tropic of Capricorn (or the Southern Tropic) is the circle of latitude that contains the subsolar point at the December (or southern) solstice. It is thus the southernmost latitude where the Sun can be seen directly overhead. It also reac ...

. The Portland Reef is made up of a submarine atoll structure lying at a depth of about 10 m.Classification of the French Polynesian atolls by Salvat (1985) and types of atolls

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Landforms of the Gambier Islands Reefs of the Pacific Ocean {{FrenchPolynesia-geo-stub