[1] The lower Sangha, the Likouala-aux-Herbes and Likouala-Mossaka rivers flow through the Congolese Cuvette, a huge depression with an equatorial climate.

[2] Between 1951 and 1993 annual rainfall in the Likouala-Mossaka basin was 1,689 millimetres (66.5 in) and average discharge at the Makoua gauging station was 216 cubic metres per second (7,600 cu ft/s).

[4] Pierre Savorgnan de Brazza explored the upper part of the Likouala-Mossaka, the Licona, in August 1878.

Giacomo Savorgnan di Brazzà descended the river when he returned from his exploration of the north in December 1885.

In 1899 the whole Likouala-Mossaka basin was granted to the Tréchot brothers who had created the Compagnie Française du Haut-Congo (CFHC) for its operation.