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"Conchagüita volcano occupies a small, 4-km-wide island in the Gulf of Fonseca across a narrow strait from Conchagua volcano. Late-stage eruptions formed a small, sharp-topped cone with a 100-m-wide summit crater at the southern end of the low 505-m-high island, and a youthful peninsula also extends from the island's eastern side. A crescent-shaped crater open to the west is located at the northern end of the island. Minor ash emissions in 1892 marked the only historical eruption from Conchagüita, the easternmost Holocene volcano in El Salvador."  -Smithsonian Volcano Archive
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