Very little as yet is known of the geology of Liberia. On the whole, its rocks appear to be ancient metamorphic rocks—gneiss, granulite, amphibolite, granites, pegmatite, all abundantly intersected by quartz veins. Decomposition products from these rocks overlie most of the country. The material and structure of the coast region is concealed by deposits of recent alluvium and the dense growth of forest; a conspicuous lithological phenomenon is laterite which covers very considerable areas and is the result of the disintegration of gneiss. As yet little is known of actual mineral values. Gold certainly occurs; magnetite and limonite appear to be widely distributed and are no doubt in abundant quantity; copper, perhaps native, certainly in good ores, occurs in the western part of the country; various localities of corundum are known, and it is claimed that rubies of good quality have been found; companies have been organized for the mining of diamonds, and it is claimed that actual gems are obtained.
5. There are many rivers in Liberia and the country is well watered. Several of these rivers are broad in their lower reaches, but they are extremely variable in depth and are generally shallow. Few of them are navigable to any distance from their mouth, and then only by small boats; thus the St. Paul’s can be ascended only to a distance of about twenty miles, the Dukwia to a distance of thirty (but along a very winding course, so that one does not anywhere reach a great distance from the coast), the Sinoe for fifteen miles, but by canoes, the Caballa (the longest of all Liberian rivers) to eighty miles.
A notable feature in the physiography of Liberia is the great number of sluggish lagoons or wide rivers, shallow, running parallel to the coast behind long and narrow peninsulas or spits of sand; there are so many of these that they practically form a continuous line of lagoons lying behind the sandy beach. These lagoons open onto the sea at the mouths of the more important rivers; smaller rivers in considerable numbers enter them so that in reality almost every river-mouth in Liberia may be considered not the point of entrance of a single river, but of a cluster of rivers which have opened into a common reservoir and made an outlet through one channel. As good examples of these curious lagoons, we may mention from west to east the Sugari River, Fisherman’s Lake, Stockton Creek, Mesurado Lagoon, Junk River, etc., etc.
Inasmuch as the rivers are the best known features of Liberian geography, and as they determine all its other details, we shall present here a complete list of them, in their order from west to east, together with a few observations concerning the more important.
Mano—Mannah: Bewa, in its upper course; the western boundary of the country; flows through a dense forest; no town at its mouth; not navigable to any distance; Gene, a trading village, twenty miles up; Liberian settlements a few miles east of the mouth.
Shuguri, (Sugary), Sugari, only a few miles in length; extends toward the southeast, parallel to the coast.
Behind the peninsula upon which Cape Mount stands is a lagoon called Fisherman’s Lake, which parallels the coast for a distance of ten miles; this shallow, brackish, lagoon is about six miles wide at its widest part, and is nowhere more than twelve or thirteen feet in depth; it is so related to the Marphy and Sugari Rivers that it is said of them, “These rivers with Fisherman’s Lake have a common outlet, across which the surf breaks heavily”; where these three water bodies enter the sea by a narrow mouth there is but three feet depth of water.
Half Cape Mount River, Little Cape Mount River, Lofa (in its upper part). Of considerable length; in the dry season a bank of sand closes its mouth; the village of Half Cape Mount is here.
Po, Poba. Small stream eight miles from last; here are the Vai village of Digby and the Liberian settlement of Royesville.
St. Paul’s, De; Diani, further up. This great river, the second of Liberia, rises on the Mandingo Plateau, about 8° 55′ north latitude; it is perhaps 280 miles long; it receives several important tributaries. There is a bar at its mouth, and it is not directly entered from the sea; it is navigable, after once being entered through Stockton Creek, to White Plains, about twenty miles from its mouth.
Mesurado River (Mesurado Lagoon) enters the sea at Monrovia and lies behind the high ridge on which that town is built. Through the same mouth with it Stockton Creek enters the sea, and through Stockton Creek, which runs across to the St. Paul’s, the latter is accessible for boats from Monrovia and the sea, although at low water there is but two feet of depth. At White Plains the St. Paul’s River is broken by rapids which occur at intervals for a distance of about seventy miles. Above these rapids it is probably possible to ascend the St. Paul’s and its tributary Tuma, Toma, might be navigable for a combined distance of about 150 miles. There are many Liberian settlements on the lower St. Paul’s River, and it is said that “quite half the Americo-Liberian population is settled in a region between Careysburg and the coast.”
Junk River parallels the coast and nearly reaches Mesurado Lagoon; a long, winding tidal creek; at its mouth three streams really enter the sea together—the Junk, Dukwia, and Farmington. On account of the near approach of this river to the Mesurado Lagoon, Monrovia is almost on an island thirty miles long and three miles wide, surrounded by the Mesurado, Junk, and the sea.
Dukwia. Very winding; navigable for thirty miles; source unknown; at its mouth is the settlement of Marshall; one of the worst bars of the coast is here.
Little Bassa, Farmington. As already stated, enters the sea together with the Junk and the Dukwia.
Mechlin, Mecklin. A small stream.
St. John’s, Hartford.
Benson, Bisso (Bissaw). The Mecklin, St. John’s, and Benson enter the sea by a common mouth. At or near this mouth are Edina, Upper Buchanan, Lower Buchanan—the latter at a fair harbor, though with a bad bar.
Little Kulloh, Kurrah. Small, but accessible to boats.
Tembo.
Fen.
Mannah.
Cestos, Cess. A considerable river, rising probably in the Satro Mountains, close to the basin of the Cavalla; very bad bar—rocks in the middle and only three feet of water.
Pua.
Pobama.
New.
Bruni.
Sanguin. Of some size; rises in the Nidi Mountains; entrance beset with rocks; though the bar here is bad, there is a depth of nine or ten feet of water, and a promising port might be developed.
Baffni.
Tubo, Tuba.
Sinu, Sinoe, San Vincento, Rio Dulce. Savage rocks, bad bar; Greenville is located at the mouth; canoes can ascend for about 15 miles; rises in the Niete or Nidi Mountains, close to the Cavalla watershed. There are three channels by which boats may enter this river. Here again we have long narrow lagoons paralleling the coast and with a mere strip of land between them and the sea. Going from the west toward the east we find the Blubara Creek and the Sinoe entering with them. The Blubara Creek is supplied by two streams, the
Bluba and the
Plassa.