The famous British explorer who mapped much of Africa in the 19th century was David Livingstone. Livingstone's extensive journeys opened the continent to Western knowledge and exploration, allowing him to chart many previously unvisited regions. His writings and missionary efforts, particularly his opposition to the slave trade, played a crucial role in informing the world about Africa. He is often remembered for his famous quote, "Dr. Livingstone, I presume?" upon meeting journalist Henry Morton Stanley in the late 1800s, symbolizing the intersection of exploration and journalism.