The Bafing rises in the Futa Jallon highlands about 2400 ft.
Of the sea on the north-eastern escarpment of the Futa Jallon highlands, the massif where also rise the head-streams of the Senegal and some of the Niger tributaries, besides the Rio Grande and many other rivers flowing direct to the Gulf of Guinea.
They are most numerous in Upper Senegal and in the countries under French sway immediately south of Senegambia, notably Futa Jallon.
Inland by a line of cliffs, the Susu Hills, which form the first step in the terrace-like formation of the interior, culminating in the massif of Futa Jallon, composed chiefly of Archean and granite rocks.
While the coast lands are either densely forested or covered with savannas or park-like country, the Futa Jallon tableland is mainly covered with short herbage.