Sungbo's Eredo is a rampart/system of walls and ditches in southwest Nigeria. It was built in honor of the Ijebu noblewoman Oloye Bilikisu Sungbo. Total length of fortifications is more than 160 kilometres (99 mi). Fortifications consist of a ditch with unusually smooth walls and bank in the inner side of ditch. The height difference between the bottom of the ditch and the upper rim of the bank on the inner side can reach 20 metres (66 ft). Works have been performed in laterite, a typical African soil consisting of clay and iron oxides. Ditch forms an uneven ring around the area of ancient Ijebu state, an area approximately 40 kilometres (25 mi) wide in north-south, with the walls flanked by trees and other vegetation, turning the ditch into green tunnel. As a construction project, it required more earth to be moved than the Great Pyramid of Giza.
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