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Tristan da Cunha is a remote group of volcanic islands in the middle of nowhere. It is in the south Atlantic Ocean, approximately 1,511 miles (2,432 km) off the coast of Cape Town in South Africa. That is roughly half way between South Africa and Brazil The main island has 278 permanent inhabitants who all carry British Overseas Territories citizenship.
See Wikipedia at https://en.wikipedia.org/wiki/Tristan_da_Cunha for more information about Tristan da Cunha.
The island, which boasts rich and detailed historical and genealogical records, has a population of just 300, believed to have descended from 15 ancestors – seven men and eight women who arrived on the island between 1816 and 1908. The current population of 278 individuals reportedly are all descended from only seven females and eight males.