René Caillié,
Travels through Central Africa to Timbuctoo and across the Great Desert to Morocco performed in the year 1824-1828…
(1830)
“ I observed some very beautiful granite of a whitish-grey colour. We passed not far from a little village, where the Foulahs were tending their cattle. As we crossed the chain of mountains, I saw the poor negroes, with loads on their heads, leaping from precipice to precipice, and every moment expected to see them fall into the yawning gulphs beneath. From the depths proceeds a dull murmur, produced by the numerous springs which rise among the mountains. They fall into the plain beneath, where they form a sort of river. ”
