Jules Verne,
Five Weeks in a Balloon — Chapter Twenty-Ninth…
(1873)
“ At length a real river greeted the gaze of our travellers, and, by the enormous ant-hills seen in its vicinity, the doctor recognized the Benoue, one of the great tributaries of the Niger, the one which the natives have called "The Fountain of the Waters.""This river," said the doctor to his companions, "will, one day, be the natural channel of communication with the interior of Nigritia. Under the command of one of our brave captains, the steamer Pleiad has already ascended as far as the town of Yola. You see that we are not in an unknown country." ”
