Friedrich Gerhard Rohlfs
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Friedrich Gerhard Rohlfs (April 14, 1831 - June 2, 1896) was a German geographer and adventurer who was the first European to cross Africa north to south. His route took him from Tripoli through the Sahara desert, over Lake Chad, along the Niger River to the Gulf of Guinea from 1865-1867. He was to the second European explorer to visit the region of the Draa Riverin the south of Morocco.