Hope you read this to see if you get any "replies".
With your interest in/knowledge of the ethnic groups around Burkina Faso/Ghana I wonder if you could help me understand the ethnic make up of the group(s) described as "Batamarriba" with respect to the World Heritage inscribed area in N. Togo (close to the frontiers with both Ghana and B. Faso) called "Koutammakou".
Our Togolese guide called these people "Tamberma" and was insistent, when we crossed over into Benin, that the "Somba" people there (only a few miles apart) were a different group. Now that could of course be so, but their houses and way of life looked the same to us and the colonially imposed boundaries of Togo/Benin hardly seemed likely to follow genuine ethnic divisions.
Now I am aware that there are different "levels" of ethnic description and that some terms can relate to "language groups" etc rather than to individual "tribes" -or even to geographic areas. I have looked on the Web for explanations but with little light being thrown on the subject. The Wiki articles on "Demographics of Togo" and "Demographics of Benin" use all 3 terms but they are not further explained. So any explanation of the differences between "Batamarriba" "Tamberma" and "Somba" would be of interest to me.
Herwith a link to my review of the WHS and the dilemma our visit to it raised http://www.worldheritagesite.org/sites/koutammakou.html
The essence of what I am trying to understand is the extent to which the inscribed site called "Koutammakou" is "unique" within its boundaries or is a Togolese "construct" for the purpose of obtaining inscription (and, if it were so, that would not be a criticism, just an increase in knowledge about "the site"!).