The Great Wall of Lagos is formidable in its design and already does a magnificent job of protecting the coastline, even though it's not yet finished. Over the last 100 years, pounding waves from the Atlantic Ocean have eroded the land off Lagos, bringing the sea closer to the financial centre of Victoria Island. The threat of serious flooding was a major concern. Before the Great Wall, tidal surges used to regularly cause water and debris to spill over on to the main coastal highway – Ahmadu Bello Way. Today the highway is clear from flooding, already protected, thanks to the development of Eko Atlantic.