With their rounded caps, some ten thousand phallic stelae dot the highlands of Sidamo and Gedeo country in southern Ethiopia, covering an area of 10,000 square kilometers. Discovered less than a century ago by a handful of explorers, these gigantic megaliths have been little studied, unlike the anthropomorphic stelae, whose research has revealed their funerary character. A team of scientists led by Roger Joussaume, a French specialist in megalithism, is carrying out an excavation campaign on the numerous archaeological sites in the region. They are attempting to date and understand this heritage, abandoned in its current state by a civilization that is still little known.