Most of the mills are situated on the banks of the watercourses in the neighbourhood of the town.
It is easy to distinguish the great primitive watercourses from the lateral ducts which they fed, the latter being almost without banks and merely traceable by the winding curves of the layers of alluvium in the bed, while the former are hedged in by high banks of mud, heaped up during centuries of dredging.
The region of dense forest, however, does not cover the whole of Liberia; the Makona river and the northern tributaries of the Lofa and St Paul's flow through a mountainous country covered with grass and thinly scattered trees, while the ravines and watercourses are still richly forested.
There are no bridges, except where watercourses occur.
The reckless destruction of forests along the watercourses also adds to the barren aspect of the country.