Just published is a new paper exploring the large assemblage of worked marine shell from Harlaa. Initially, it was thought that species such as the cowries were imported from the Indian Ocean. Subsequent research has found that all were available from the Red Sea and the Gulf of Aden, c. 120 km east of Harlaa. This suggests that a hitherto largely unrecognised source of marine shells was available, and the Red Sea might have supplied not only the Horn of Africa, but other markets, potentially including Egypt, and from there, elsewhere in North Africa and ultimately West Africa via trans-Saharan routes, as well as Nubia and further south on the Nile in the Sudan, the Arabian Peninsula, and the Arabian/Persian Gulf. The details are, Insoll, T. 2021.Marine Shell Working at Harlaa, Ethiopia, and the Implications for Red Sea Trade. Journal of African Archaeology 19: 1-24. The paper is available open access at this link.