As he descended the Zambesi and approached the Indian Ocean, the stream gathered breadth and volume from great tributaries which flow into it on either side. The Kafue, hardly smaller than the Zambesi itself, comes into it from the north. Its course has still to be traced and its source has yet to be visited. Further down, the Loangwa, also a mighty river, enters it, and its banks, like those of the Kafue, are thickly populated, and rich in mineral treasures. The great Zambesi sweeps majestically on from one reach of rich tropical scenery to another. On its shores are seen the villages of native fisherman. Their huts and clearings for cotton and tobacco are girded about by dense jungles of bamboo, back of which rise forests of palm. Behind the forests the grand hills slope up steeply, diversified with clumps of timber and fringed with trees to their summits. Behind, extend undulated plains of long grass to the base of a second range of hills, the outer bank of the Zambesi Valley. Now and then, on either bank, a river valley opens, whose sides are thickly overgrown with jungle, above which rise the feathery tops of the palms and the stately stems of the tamarind; on their margins, or on the slopes above, herds of buffaloes, zebras, roebucks and wild pigs may be seen peacefully grazing together, with occasionally a troop of elephants or a solitary rhinoceros. Dr. Livingstone says, nowhere in all his travels has he seen such an abundance of animal life as in this portion of the Zambesi.