The Abidjan–Lagos Corridor, also known as the Abidjan–Lagos Megalopolis, is an emerging transnational megalopolis on the coast of southern West Africa. It stretches from Abidjan to Lagos, crossing five independent states (Côte d'Ivoire, Ghana, Togo, Benin, and Nigeria) from west to east, and includes two political capitals and many regional economic centers (https://en.wikipedia.org/wiki/Abidjan%E2%80%93Lagos_Corridor)
Corridor trend or concept line