Rivadeneyra Shoal is a

shoal In oceanography, geomorphology, and geoscience, a shoal is a natural submerged ridge, bank, or bar that consists of, or is covered by, sand or other unconsolidated material and rises from the bed of a body of water to near the surface. It ...

seamount A seamount is a large geologic landform that rises from the ocean floor that does not reach to the water's surface (sea level), and thus is not an island, islet or cliff-rock. Seamounts are typically formed from extinct volcanoes that rise abru ...

in the

Eastern Pacific Ocean The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean (or, depending on definition, to Antarctica) in the south, and is bounded by the continen ...

between

Malpelo Island Malpelo is a small oceanic island in the eastern Pacific Ocean, located about west of the Colombian mainland with a military post manned by the Colombian Armed Forces. It consists of a sheer and barren rock with three high peaks, the highest ...

and

Cocos Island Cocos Island ( es, Isla del Coco) is an island in the Pacific Ocean administered by Costa Rica, approximately southwest of the Costa Rican mainland. It constitutes the 11th of the 13 districts of Puntarenas Canton of the Province of Puntarenas ...

. It was reported in October 1842 at the position with a depth of 10 feet. It was unsuccessfully searched for by the British war vessels and in 1854 and 1857 respectively, and by the in 1885.

Sources

* Findlay, Alexander George (1851). ''A Directory for the Navigation of the Pacific Ocean''. London: Laurie, p 1054. * Great Britain Hydrographic Office (1860). ''South America Pilot: Including Magellan Strait, the Falkland and Galapagos Islands''. Eyre and Spottiswoode, p 394. * Stommel, Henry (1984). ''Lost Islands: The Story of Islands That Have Vanished from Nautical Charts''. Vancouver: University of British Columbia Press, p 113. . Phantom islands Reefs of the Pacific Ocean Seamounts of the Pacific Ocean 1842 establishments {{marine-geo-stub