 In 1805 the London engraver John Cary showed them for the first time linking to the Moon Mountains.Various nineteenth century explorers of West Africa included the range on maps they produced or directed the production of after exploring the area.These include French explorer René Caillié, who explored the highlands of Guinea at Fouta Djallon, near the source of the Niger; the Cornish explorer Richard Lemon Lander and his younger brother John; and Scottish explorer Hugh Clapperton who also sought the course of the Niger River in its upper reaches.