An interesting piece in The Guardian by Harold French on Africa’s megalopolis and the difficulties of pulling together five countries with very different governments and colonial histories:
There is one place above all that should be seen as the centre of this urban transformation. It is a stretch of coastal west Africa that begins in the west with Abidjan, the economic capital of Ivory Coast, and extends 600 miles east – passing through the countries of Ghana, Togo and Benin – before finally arriving at Lagos. Recently, this has come to be seen by many experts as the world’s most rapidly urbanising region, a “megalopolis” in the making – that is, a large and densely clustered group of metropolitan centres.
…In just over a decade from now, its major cities will contain 40 million people. Abidjan, with 8.3 million people, will be almost as large as New York City is today. The story of the region’s small cities is equally dramatic. They are either becoming major urban centres in their own right, or – as with places like Oyo in Nigeria, Takoradi in Ghana, and Bingerville in Ivory Coast – they are gradually being absorbed by bigger cities. Meanwhile, newborn cities are popping into existence in settings that were all but barren a generation ago. When one includes these sorts of places, the projected population for this coastal zone will reach 51 million people by 2035, roughly as many people as the north-eastern corridor of the US counted when it first came to be considered a megalopolis.
But unlike that American super-region, whose population long ago plateaued, this part of west Africa will keep growing. By 2100, the Lagos-Abidjan stretch is projected to be the largest zone of continuous, dense habitation on earth, with something in the order of half a billion people.