The southern frontier is formed by the escarpments which separate the Niger basin from those of the coast rivers of Liberia.
From the valleys their rugged, deeply indented escarpments, stretching away to the horizon, have the appearance of a continuous chain of mountains.
The most extensive Scottish escarpments are found among the igneous rocks.
The rocks at the base of the slopes are granite, the upper escarpments are of sedimentary rocks.
Through these gorges dash magnificent cascades, others leaping the escarpments of the plateaus in waterfalls of great volume and depth.