The St. Helena Seamount chain, also known as the St. Helena Seamounts, is an underwater chain of

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 ...

s in the southern Atlantic Ocean. The chain has been formed by the movement of the African Plate over the

Saint Helena hotspot The St. Helena hotspot is a volcanic hotspot located in the southern Atlantic Ocean. It is responsible for the island of St. Helena and the St. Helena Seamount chain. It is one of the oldest known hotspots on Earth, which began to produce basal ...

.Plates, Plumes, and Paradigms
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References

Geography of Saint Helena Seamount chains Seamounts of the Atlantic Ocean Geology of Saint Helena, Ascension and Tristan da Cunha . {{SaintHelena-geo-stub