This is the first interdisciplinary history of Lake Tanganyika and of eastern Africa's relationship with the wider Indian Ocean World during the nineteenth century. Philip Gooding deploys diverse source materials, including oral, climatological, anthropological, and archaeological sources, to ground interpretations of the better-known, European-authored archive in local epistemologies and understandings of the past. Gooding shows that Lake Tanganyika's shape, location, and distinctive lacustrine environment contributed to phenomena traditionally associated with the history of the wider Indian Ocean World being negotiated, contested, and re-imagined in particularly robust ways. He adds novel contributions to African and Indian Ocean histories of urbanism, the environment, spirituality, kinship, commerce, consumption, material culture, bondage, slavery, Islam, and capitalism. African peoples and environments are positioned as central to the histories of global economies, religions, and cultures.