Some of the later rainforest kingdoms achieved great feats of engineering, including elaborate moats and ramparts, the most famous of which is Ijebu´s:

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"Sungbo's Eredo" is a system of defensive walls and ditches located in the rainforest of the Ijebu region in Nigeria. It is considered one of the largest pre-colonial monuments in Africa, demonstrating significant engineering skills.

Some of the Later Rainforest Kingdoms Achieved Great Feats of Engineering