Africa and its inhabitants . nterior. The Cacheo, northernmost of these streams, called also Pio de Farim and DeSanto Domingos, rims nearlj parallel with the Casamanza, from which it isseparated by a gently undulating tract with a mean breadth of 24 miles. Intheir lower course the two estuaries intermingle their waters through an intricatesjstem of channels and marshlands, beyond which the Cacheo enters the seathrough a wide mouth obstructed by a muddy sill. The Geba, south of the Cacheo, rises as the Ba-Diemba in the unexploredregion limited eastward by the headwaters of the Gambia, flowing t
Africa and its inhabitants . nterior. The Cacheo, northernmost of these streams, called also Pio de Farim and DeSanto Domingos, rims nearlj parallel with the Casamanza, from which it isseparated by a gently undulating tract with a mean breadth of 24 miles. Intheir lower course the two estuaries intermingle their waters through an intricatesjstem of channels and marshlands, beyond which the Cacheo enters the seathrough a wide mouth obstructed by a muddy sill. The Geba, south of the Cacheo, rises as the Ba-Diemba in the unexploredregion limited eastward by the headwaters of the Gambia, flowing thence parallelwith the Cacheo, but soon losing its fluvial aspect. For a space of over 60 milesit develops a wide estuary like a great arm of the sea, accessible to vessels ofconsiderable draught and no less than 10 miles wide at its mouth. In front of thismouth are scattered the Bissagos islets and reefs, forming a vast labyrinth of GUIXf:. 183 channels dangerous to navigation, but which may be avoided by one of the lateral. passages commimicating diiectlv with the Ocba. iaitbcr south this system of 184 WEST AFEICA. chiiunels merges in the Rio-Grande estuarj-, less spacious than that of the Geba,although the latter appears to be much the smaller river of the two. The Rio-Graxde. The Rio-Grande, called also the Guinala, appears to be the chief waterway inPortuguese Senegambia. It is supposed to rise on the same plateau as theGambia, flowing not east but west, and under the name of the Comba collectingnumerous torrents from the Futa-JaUon highlands. Of these the largest is theTomin^, which also gathers its first waters from the neighbourhood of of the districts traversed by it is intersected bj- such a number of rivuletsthat it takes the name of Donhol, that is, Land of Waters. Even in the dryseason it has a discharge of over 350 cubic feet per second at 90 miles from itssource, where it winds through a broad valley skirted on both sides by cliffs from850 to 1,000 feet
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