Iroungou cave
Iroungou Cave is a burial cave located near the city of Mouila in the Ngounié Province of Gabon. It is an archaeological site dating from pre-colonial Africa. It is a collective burial site with the remains of at least 28 people, and hundreds of iron, copper and shell artefacts. The site has no equivalent in West central Africa.
Cave data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).