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Tagssungbo
1 place carries this tag, across every kind and continent it appears in.
🇳🇬 Nigeria · Earthwork
Late Iron Age / Yoruba (Ijebu) · Ijebu Yoruba (Oloye Bilikisu Sungbo tradition)
Largest single monument in Africa: 160 km curvilinear ditch-and-bank snaking 20 m deep through rainforest around medieval Ijebu kingdom (800–1000 CE, Darling charcoal).