2 ( No. 98 GEOGRAPHY Kassala , on the eastern frontier between 13° and 17° 30' north latitude, 44,900 square miles . Sennar, the region east of the White Nile between go and 140 north latitude, 38,700 square miles . Upper Nile , comprising the river zone between gº and 120 north latitude , 36,200 square miles. Bahr el-Ghazal, between Kordofan and the south western ' frontier, west of the Nile , 114,100 square miles .

2 Sobat-Pibor, between the Bahr el-Jebel and the Abyssinian frontier north of 6° north latitude, 24,400 square miles. Mongalla , " between 6° north latitude and the Uganda frontier, 63,800 square miles. Darfur , between Kordofan and French Equatorial , Africa, 153,300 square miles . A certain unity is given to this vast country by the apper and middle valley of the Nile, whïch traverses it from south to north , and forms a great natural line of communication over 2,000 miles in length, linking the region of the equatorial lakes with Egypt and the Mediterranean.

In the north, the boundary dividing the Sudan from Egypt, as agreed by the British and Egyptian Govern ments in 1899 , runs from a point as yet undetermined in the Libyan Desertto the Wadi Gabgaba along the parallel of 22° north latitude. North of Wadi Halfa, however, a small enclave extends 20 miles north to Faras Island . East of Wadi Gabgaba the line is defined by a series of mountain summits as far as Bir Shalatein on the Red Sea coast (23° 10' N. , 35° 35' E. ) .

The eastern frontier is formed by the Red Sea from Bir Shalatein to 18° north latitude. Thence the section between the Sudan and Eritrea runs in a general south 1 Strictly , this is a military district , not a province . It is announced (March, 1919) in Army Orders (Khartum ) that the Upper Nile and Sobat-Pibor Districts are to be amalgamated and known as the Upper Nile and Pibor District ; headquarters of the district to be at Akobo .

2 Including the old Lado Enclave .

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