[5] The lower sections of the Sangha and Likouala-aux-Herbes flow through flat land with little difference in elevation between the two rivers.

[6] Not long ago the Likouala-aux-Herbes joined the Sangha 130 kilometres (81 mi) upstream from the present confluence.

[2] Between 1951 and 1993 annual rainfall in the Likouala-aux-Herbes basin was 1,714 millimetres (67.5 in) and average discharge at the Botouali gauging station was 281 cubic metres per second (9,900 cu ft/s).

[2] Vegetation in the river basin is dense, humid, shady forest that partly floods during the high water season.

[9] Below Epena the villages along the river include Itanga, Dzeke, Edzama, Bouanela and Ebambe, almost 350 kilometres (220 mi) downstream.

[13] The Lake Télé Community Reserve covers a large area adjoining the right (west) bank of the upper Likouala-aux-Herbes to the east of Epena.

Mammals include western lowland gorillas, chimpanzees, elephants, buffaloes, duikers and hippopotamuses.