 The historians Thomas Basset and Phillip Porter have identified forty maps showing the mountains published between 1798 and 1892.Despite the failure of other later explorers to locate the range, it continued to appear on maps until late in the nineteenth century.Cartographers stopped including the mountains on maps after French explorer Louis Gustave Binger established that the mountains were fictitious in his 1887–89 expedition to chart the Niger River from its mouth in the Gulf of Guinea and through Côte d'Ivoire.