The South Atlantic Ocean and its islands (Saint Helena, Tristan da Cunha, Ascension) were a periphery of the British Empire. Nevertheless this region faced a dramatic transformation during the Global Age of Revolutions (1780-1830) and moved from being a transition zone between Europe and Asia into a proper maritime system. The great global issues of labour (slavery, indentured labour, white emigration), environment (environmental imperialism and imperial environmentalism) and Empire (colonial government, authority and freedom) evolved in the micro-histories of the South Atlantic islands in a very peculiar way, making them precious case-studies to assess wider themes in a new perspective.