| | |there are several pieces of | | |broken water, but nothing | | |worthy of the term “cataract” | | |is to be met with until | | |opposite Dulka Island, where | | |the cataract of Ragabat El | | |Gamal obstructs the river; it | | |is not difficult. Boni Island | | |lies on the right side of the | | |river, abreast of and | | |overlapping Dulka Island, and | | |between it and the right bank | | |the cataract of Abu Sayal is | | |situated. It is impassable at | | |low Nile. In the centre of Boni | | |Island, and in prolongation of | | |the Kirbekan ridge, is a | | |remarkable round-topped | | |mountain, which can be seen for | | |several miles before Boni | | |Island is reached. | | | | | |On leaving the belt of | | |cultivation at Berti, the track | | |leaves the river and winds | | |through a mass of rocks and | | |boulders until it again strikes | | |the river opposite a small | | |island, on which are the | | |remains of a ruined castle | | |(Castle Camp of River Column); | | |distance from Berti, 6 miles. | | |Scant cultivation and a good | | |camping ground for a small | | |force are here to be found. | | | | | |After leaving the bank opposite | | |the ruined castle, the track | | |again quits the river and | | |follows the bed of a sandy | | |khor, interrupted in parts by | | |belts of rocks and boulders