The breakwater crescent of Jebel Ali is 15 km long and 200 m wide in cross section. The crest height, 4.25m above sea level, is higher than Jumeirah’s because of the greater water depth. The seaward slope, however, is the still one in two. There are a retaining wall between the crescent and the palm islands, and three openings, more than Jumeirah because of its greater crescent length.