Tristan da Cunha, colloquially Tristan, is a remote group of volcanic islands in the South Atlantic Ocean. It is the most remote inhabited archipelago in the world, lying approximately 2,787 kilometres from Cape Town in South Africa, 2,437 kilometres from Saint Helena, 3,949 kilometres from Mar del Plata in Argentina, and 4,002 kilometres fro…Tristan da Cunha, colloquially Tristan, is a remote group of volcanic islands in the South Atlantic Ocean. It is the most remote inhabited archipelago in the world, lying approximately 2,787 kilometres from Cape Town in South Africa, 2,437 kilometres from Saint Helena, 3,949 kilometres from Mar del Plata in Argentina, and 4,002 kilometres from the Falkland Islands.