34 (No. 96 HISTORY French frontier to the north, viz. , the source of the Mbomu river. By i907 all Congolese troops had with drawn to their side of this frontier. In 1908 the Congo Free State became a colony of Belgium, since which time relations between the Sudan and the Belgian officials have always been cordial.

A joint boundary Commission for the delimitation of the frontierwas arranged for the end of 1914 , but its work was postponed by the outbreak of the European War.

By the Agreement of May 1906the so -called “Mahagi strip of land , giving access from the west to Lake Albert, was leased to the Belgian Congo, and this strip was actually delimited in 1913. Since the readjust ment of the Sudan -Uganda frontier of 1914 thisnow concerns Uganda only.

Apart from some recent disturbances with native chiefs where the three frontiers—Belgian , French , and Sudanese - meet, to suppress which the officials of the three countries co -operated heartily and successfully.

nothing has happened to disturb the peace of this frontier. The ever-threatening peril of sleeping -sick ness ( bequeathed first to the Sudan with the Lado Enclave, and a serious menace on the Yei river ) calls for similar co-operation in the enforcement of such quarantine and otherprecautions as may be possible.

( 6 ) The French Ubanghi Frontier. — This frontier between the Sudan and French spheres of influence, was defined by a declaration, signed at London on March21, 1899 (completing the “ Convention between Great Britain and France of June 14, 1898 ), and by a supplementary convention signed on September 8 , 1919 (cf. above, p . 4 ). By this the frontier line was drawn northwards from the source of the Mbomu river along the Nile -Congo divide for some 450 miles; next it separated Darfur on the east from Wadai the west , and then ran north -west up to the frontier of Tripoli. In 1899 the French had -on 1 Fixed by the Agreement of August 14 , 1894 , between France and the Congo Free State .