Belgian Congo 5 FRONTIERS ; SURFACE Various agreements define the Belgo-Portuguese frontier, the most important of which are the Agreement of May 25, 1891 , the Declaration of March 24, 1894, and the letters exchanged between the two Powers in April and June 1910. From the meridian of 24° east the boundary runs westward along the Congo-Zambezi watershed to the neighbourhood of Lake Dilolo . At this point the boundary leaves the divide and strikes the upper course of the Kasai, which then becomes the boundary as far north as 7 ° 17 ' south. From this point the frontier runs westward for a con siderable distance across the tributaries of the Kasai and becomes very irregular. Its general direction is westwards along the parallel of 7°.17 ' south as far as the Chikapa, down that river to a point a little north of the 7th parallel, west to the Loange, and up that and other rivers as far as the 8th parallel.

This it follows fairly closely to the Kwango, along which it runs to the north . The details of the delimita tion, which was carried out in 1894, can be shown only on a large-scale map. (See Appendix No. IV. ) From the Kwango to Noki on the lower Congo the boundary was finally adjusted by an agreement of July 5, 1913. It follows approximately the parallel of 5° 52 ' south ; but, of forty -five places mentioned through which it is to pass, a number lie a little to the north and a number a little to the south of that parallel.

(2 ) SURFACE , COAST, LAKES , AND RIVER SYSTEM Surface The greaterpart ofthe south of Africaconsists of a high plateau which is continued northward by the highlands of East Africa and the coastal ranges of West Africa . Between these lies the low plateau which forms the