The man who traced the Congo River to its source in 1877?

The man who traced the Congo River to its source in 1877 was Henry Morton Stanley. An American explorer and journalist, Stanley undertook this expedition to explore and map the river, which had been largely uncharted at the time. His journey significantly contributed to European knowledge of Central Africa and helped pave the way for further exploration and colonization of the region. Stanley's findings were published in his book "Through the Dark Continent," which gained widespread attention.