Jamestown is the capital of the British Overseas Territory of Saint Helena, Ascension and Tristan da Cunha, located on the island of Saint Helena in the South Atlantic Ocean. Wikipedia
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Saint Helena is a volcanic tropical island in the South Atlantic Ocean, 4,000 kilometres east of Rio de Janeiro and 1,950 kilometres west of the Cunene River, which marks the border between Namibia and Angola in southwestern Africa.
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