This paper provides a review of existing literature on cross-border trade among the Horn of African countries Djibouti, Eritrea, Ethiopia, Kenya and Somalia. It offers analysis on key traded products particularly food crops and livestock, a review on main trade routes and border marketing centers;the operation of cross-border value chains in the borderlands, including the economic impact on border communities and a summary of commonchallenges facing cross-border trade within the region. The review is augmented with analysis of available data on trade between these countriesfrom UN COMETRADE, FEWS NET and FAO.To put cross-border trade in context, the paper starts by reviewing the available information from officially recorded trade data.