But his travels and tedious labours in Lunda and the adjacent countries have established beyond doubt--first, that the Chambezi is a totally distinct river from the Zambezi of the Portuguese; and, secondly, that the Chambezi, starting from about latitude 11 degrees south, is no other than the most southerly feeder of the great Nile; thus giving that famous river a length of over 2,000 miles of direct latitude; making it, second to the Mississippi, the longest river in the world. The real and true name of the Zambezi is Dombazi. When Lacerda and his Portuguese successors, coming to Cazembe, crossed the Chambezi, and heard its name, they very naturally set it down as "our own Zambezi," and, without further inquiry, sketched it as running in that direction. During his researches in that region, so pregnant in discoveries, Livingstone came to a lake lying north-east of Cazembe, which the natives call Liemba, from the country of that name which bordered it on the east and south. In tracing the lake north, he found it to be none other than the Tanganika, or the south-eastern extremity of it, which looks, on the Doctor's map, very much like an outline of Italy. The latitude of the southern end of this great body of water is about 8 degrees 42 minutes south, which thus gives it a length, from north to south, of 360 geographical miles. From the southern extremity of the Tanganika he crossed Marungu, and came in sight of Lake Moero. Tracing this lake, which is about sixty miles in length, to its southern head, he found a river, called the Luapula, entering it from that direction. Following the Luapula south, he found it issue from the large lake of Bangweolo, which is nearly as large in superficial area as the Tanganika. In exploring for the waters which discharged themselves into the lake, he found that by far the most important of these feeders was the Chambezi; so that he had thus traced the Chambezi from its source to Lake Bangweolo, and the issue from its northern head, under the name of Luapula, and found it enter Lake Moero. Again he returned to Cazembe's, well satisfied that the river running north through three degrees of latitude could not be the river running south under the name of Zambezi, though there might be a remarkable resemblance in their names.