Flag of Saint Helena, Ascension and Tristan da Cunha
From Infogalactic: the planetary knowledge core
Saint Helena, Ascension and Tristan da Cunha, a British Overseas Territory, does not have its own flag, however, the three administrative divisions do have their own flags:
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Flag of Saint Helena
Flag ratio: 1:2
Before 2009, Ascension Island and Tristan da Cunha were dependencies of Saint Helena, and the flag of Saint Helena was used on all three islands.