Sudan Anglo -Egyptian] FRONTIER HISTORY 33 tion of some 50,000, bounded on the east by the Nile and Lake Albert ; on the north by a straight line running due east from the old Belgian Nile station of Kiro ( approx . 5° 50' N. ) to longitude 30° E .; and on the west by longitude 30° E. till it reaches the Nile Congo watershed ; then along the water -parting to a point two-thirds of the way down the western shore of Lake Albert . This was assigned to the Congo Free State by an agreement, signed at London on May 9, 1906 , which itself cancelled the Brussels Agreement of May 12, 1894. This earlier agreement had surrendered to King Leopold all the country south of 10° N. latitude and east of 35º E. longitude at a time when the Upper Nile valley was either in Dervish possession or NoMan's Land, and the Belgian effective occupation was limited to a few posts on the river near Wadelai.'

The Agreement of 1906 contracted and defined the boundaries of Belgian territory on and west of the Bahr el -Jebel . But by the Agreement the Lado Enclave , as it was called , reverted to the Sudan on the death of King Leopold ; and it was in consequence formally surrendered to the Sudan Government without any friction on June 16 , 1910 . By_a proclamation of August 4 , 1910, the former Lado Enclave became part of Mongalla province. The subsequent frontier arrangement with Uganda transferred the southern portion of it to the latter Protectorate .

The Belgian Congo Frontier. - In 1904 the Belgian Lemaire Mission , coming from the Congo Free State, established five fortifiedposts on the Sudanese side of the Nile -Congo divide in Bahr el-Ghazal province ; and King Leopold showed so obvious a disposition to annex the district thus temporarily occupied that a somewhat acute political tension resulted. ended by the Agreement ofMay 9 , 1906 , which fixed the Nile -Congo divide as the frontier as far as the This was > Chaltin's Congo column occupied Rejaf in 1897.