THREE-QUARTERS of the world is covered by water and up to 90% of world trade is seaborne. Seaports and shipping are critical to the conduct of global trade. Africa has relatively few natural harbours that offer shelter and are deep enough to take big vessels. Along the Atlantic coastline of West Africa, for instance, natural harbours exist only at Freetown and Lagos. Consequently, artificial ports have been carved out of lagoon and river ports, which dot the coastline from Morocco to South Africa. Considerable capital and engineering know-how have been applied since the late nineteenth century to make African ports…