Watershed
The Congo River basin has the form of a huge, shallow saucer. The Luvua breaks through the southeast rim of this saucer, bringing water from the Mweru-Bangweulu watershed. The Luvua drains an area of over 218,000 square kilometres (84,000 sq mi), much of which was at one time part of the Zambezi watershed. There is strong faunal evidence for the Luvua basin having once been part of the Zambezi system, with several species of fish that are common in the Zambezi system also being found in the Luvua. Congo fauna have penetrated up the Luvua into Lake Mweru, but have been blocked by the Mambatuta Falls from entry into Lake Bangweulu. The transition occurred in the early Tertiary.
Read more about this topic: Luvua River