The High Dam, or el-Sadd el-Ali, some 4mi/7km above the old Aswan Dam, is a massive accumulation of 55.9 billion cu. yd/42.7 billion cu. m (17 times the volume of the Pyramid of Cheops) of stones and sand with a clay core and a concrete facing.A four lane road runs across the top of the dam. A memorial, a triumphal arch and an inscription commemorate the completion of this huge enterprise and the cooperation between Egypt and the Soviet Union in its realization.One undoubted benefit has been an increase of 20-30% (1,250,000-2,000,000 acres) in cultivated land, together with increased agricultural yields as a result of even and regular irrigation.